Term
| The human body is a good conductor of electricity and if placed in the path of an electrical charge, serious injury and death may result from paralysis of the ___ or of the ___ centers. |
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Definition
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Term
| A ___ person trained in CPR should be available on each job site. |
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Definition
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Term
| It is important to remember that ___ is the shock factor rather than the amount of volts. |
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Definition
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Term
| When the skin is dry it has a ___ resistance to an electrical shock. |
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Definition
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Term
| When working on or near electrical equipment and panels, it is best to use a ladder made of a material which is a ___ of electricity. |
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Definition
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Term
| Electricity is a form of ___ which, under certain conditions, can injure the human body and cause death. |
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Definition
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Term
| Extension cords must be plugged into an OSHA approved ___ receptacle. |
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Definition
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Term
| Never disconnect the equipment ___ wire from a piece of equipment. |
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Definition
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Term
| The possible hazard in testing ___ valves with a meter can be avoided by closing the manual gas valve. |
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Definition
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Term
| Never use carbon tetrachloride or refrigerants as a ___ agent. |
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Definition
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Term
| A body has a negative charge when it... |
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Definition
| contains an excess of electrons. |
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Term
| Static electricity is produced by... |
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Definition
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Term
| A molecule of a substance is made up of... |
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Definition
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Term
| When matter is separated into individual atoms, it... |
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Definition
| has been reduced to its basic elements. |
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Term
| The nucleus of an atom contains... |
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Definition
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Term
| The force acting between two bodies dissimilar in charge... |
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Definition
| is referred to as an electrostatic field. |
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Term
| When the molecules of a substance are altered, the action is referred to as... |
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Definition
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Term
| Electrons travel at the speed of light, which is about... |
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Definition
| 186,000 miles per second. |
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Term
| When voltage is applied to a conductor, free electrons... |
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Definition
| are impelled along the conductor. |
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Term
| Electricity is a batter produced by... |
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Definition
| a chemical action, a chemical reaction, and a chemical acting upon metallic plates. |
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Term
| The dry cell battery is a... |
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Definition
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Term
| The electrolyte of a lead-acid wet cell is... |
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Definition
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Term
| A battery that can be restored after discharge is a... |
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Definition
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Term
| The plates of a lead-acid battery are made of... |
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Definition
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Term
| How many cells does the ordinary 6-V lead-acid storage battery consist of? |
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Definition
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Term
| Electrically operated devices in gas burning equipment use the electricity producing principle of... |
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Definition
| dissimilar metals heated. |
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Term
| Soft iron is most suitable for use in a... |
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Definition
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Term
| A substance is classified as a magnet if it has... |
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Definition
| the property of magnetism. |
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Term
| If a compass is placed at the center of a bar magnet, the compass needle... |
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Definition
| aligns itself parallel to the bar. |
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Term
| The magnetic pole that points northward on a compass... |
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Definition
| is called the north pole. |
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Term
| Around a magnet, the external lines of force... |
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Definition
| leave the magnet from the north pole and enter the south pole. |
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Term
| Most permanent magnets and all electromagnets are... |
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Definition
| classed as artificial magnets. |
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Term
| When a conductor moves across a magnetic field... |
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Definition
| a V is induced in the conductor. |
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Term
| A material that acts as an insulator for magnetic flux is... |
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Definition
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Term
| The unit of magnetic flux is the... |
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Definition
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Term
| Flux in a magnetic circuit compared in an electrical circuit with... |
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Definition
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Term
| The word permeability indicates the... |
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Definition
| ability of a substance to conduct magnetic lines of force. |
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Term
| Current flow in a straight conductor produces... |
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Definition
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Term
| The magnetic field around a current-carrying wire... |
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Definition
| exists at all points along its length. |
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Term
| When two parallel conductors carrying current in the same direction are placed side by side, the fields produced by both... |
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Definition
| encircle each other, drawing the conductors together. |
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Term
| Which of the following materials incurs low hysteresis loss when used for transformer cores and similar applications? |
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Definition
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Term
| When loops of wire are formed into a coil and current is passed through the coil... |
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Definition
| the magnetic field of each turn of wire links with the fields of adjacent turns. |
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Term
| In which direction does current flow in an electric circuit? |
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Definition
- to + externally
+ to - internally |
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Term
| A lamp has a source V of 110 V and a current of 0.9 AMP. What is the resistance of the lamp? |
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Definition
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Term
| If E=24V and I=0.2Ampere, what is R? |
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Definition
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Term
| If I=3Ampere and R=0.4ohms, what is E? |
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Definition
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Term
| Other factors remaining constant, what would be the effect on the current flow in a given circuit if the applied potential were doubled? |
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Definition
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Term
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Definition
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Term
| The current needed to operate a soldering iron that has a rating of 600W at 110V is... |
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Definition
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Term
| In electrical circuits, the time of doing work is expressed in... |
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Definition
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Term
| What formula is used to find watt-hours? |
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Definition
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Term
| The device used in circuits to prevent damage from overloads is called a... |
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Definition
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Term
| If the resistance is held constant, what happens to power if the current is doubled? |
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Definition
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Term
| If R=13ohms and P=13watts, what is I? |
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Definition
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Term
| If a circuit is constructed so as to allow the electrons to follow only one possible path, the circuit is call a... |
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Definition
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Term
| According to Kirchhoff's volt law, total volt drop in a series circuit is equal to... |
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Definition
| the amount of amp in the circuit. |
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Term
| In a series circuit, the total current is... |
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Definition
| the same through all parts of the circuit. |
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Term
| If an additional resistor were placed in parallel, the current I(t) would... |
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Definition
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Term
| Three resistors of 2, 4, and 6 ohms, respectively, are connected in parallel. Which resistor would absorb the greatest power? |
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Definition
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Term
| If three lamps are connected in parallel with a power source, connected a fourth lamp in parallel will... |
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Definition
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Term
| R(T)=24 ohms, R(1)=40 ohms, what does R(2) equal? |
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Definition
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Term
| The minimum number of resistors in a compound circuit is... |
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Definition
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Term
| In a three-wire distribution system, an unbalanced situation is indicated by the... |
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Definition
| current in the neutral wire. |
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Term
| A mil is what part of an inch? |
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Definition
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Term
| A mil is a term used chiefly to specify... |
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Definition
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Term
| The discharge (electrical leakage) that might occur from a wire carrying a high potential is called... |
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Definition
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Term
| Dielectric strength is the... |
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Definition
| ability of an insulator to withstand a potential difference. |
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Term
| The factors governing the selection of wire size are... |
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Definition
I(2)R loss in the line,
IR drop in the line,
current-carrying ability of the line. |
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Term
| Enamel insulated conductors usually are called... |
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Definition
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Term
| The advantage of solderless connectors over soldered-type connectors is that they are... |
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Definition
mechanically strong,
easier to install,
free of corrosion. |
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Term
| The wire commonly used for ordinary light and power wiring in buildings is rated for... |
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Definition
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Term
| How much larger is the maximum voltage value than the effective voltage value? |
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Definition
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Term
| Frequency as applied to alternating current or voltage is the number of... |
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Definition
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Term
| Most alternating current voltmeters and ammeters are calibrated in... |
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Definition
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Term
| The effective voltage is... |
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Definition
| 0.707 times the maximum voltage. |
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Term
| Alternating current is most generally used than is direct current because... |
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Definition
| its voltage is easily changed. |
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Term
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Definition
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Term
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Definition
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Term
| In three-phase alternating current, the several currents: |
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Definition
| are out of phase by 120 degrees. |
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Term
| Inductance is the property of an electric circuit that: |
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Definition
| opposes any change in the current through that circuit. |
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Term
| When the magnetic field is collapsing, the induced emf: |
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Definition
| aids and tends to prolong the impressed current. |
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Term
| The unit of inductance is the: |
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Definition
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Term
| Factors that determine the capacitance of capacitors are: |
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Definition
| type and thickness of the dielectric and the plate area. |
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Term
| Capacitance is the property of an electric circuit that: |
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Definition
| opposes any change in voltage. |
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Term
| When a capacitor is charged, it has: |
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Definition
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Term
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Definition
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Term
| In a balanced three-phase system, the phase emf's differ in phase by: |
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Definition
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Term
| The phase current for a delta connected transformer is: |
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Definition
| 1.731 times the line current |
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Term
| Hz is the abbreviation for: |
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Definition
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Term
| The most common type of voltage system used today is: |
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Definition
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Term
| Air-conditioning equipment operates more satisfactory on: |
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Definition
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Term
| The ration between true power and apparent power is called: |
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Definition
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Term
| The three principle parts of a transformer are its... |
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Definition
| core, primary windings, and secondary windings. |
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Term
| The principle of operation of a transformer is... |
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Definition
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Term
| An iron core is used in a transformer to... |
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Definition
| strengthen the magnetic flux and increase efficiency. |
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Term
| Transformer cores are laminated to... |
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Definition
| reduce eddy-current losses. |
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Term
| A transformer that is sized too small will... |
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Definition
| burn out due to an overload condition. |
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Term
| The proper size fuse for protecting a secondary winding for a 100 voltampere transformer at 24 V output is... |
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Definition
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Term
| An electric motor is a device for changing electrical energy into... |
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Definition
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Term
| The ends of the rotor windings are connected to the... |
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Definition
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Term
| The stationary part of a motor is called the... |
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Definition
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Term
| The rotation of a three-phase motor can be reversed by interchanging... |
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Definition
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Term
| The purpose of an iron core is to... |
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Definition
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Term
| A single-phase motor needs a supplementary device to make it... |
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Definition
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Term
| A motor that does not use a commutator or brushes is called... |
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Definition
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Term
| The natural speed of the rotating magnetic field of the stator is called... |
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Definition
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Term
| A knife-switch should not be used to stop a motor because... |
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Definition
| it may be damaged by arching. |
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Term
| When a three-phase motor single-phase, it... |
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Definition
| draws power from only one phase. |
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Term
| An overload device with a bimetal element in the shape of a disc is called... |
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Definition
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Term
| A safety device with an automatic reset may be desirable because... |
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Definition
| it reduces the amount of personal attention needed. |
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Term
| After a motor has opened on excessive temperature it... |
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Definition
| will take 20 minutes up to several hours to reset. |
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Term
| The difference between a motor contactor and a motor starter is that a motor starter has... |
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Definition
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Term
| Some control devices are said to be pilot duty types because... |
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Definition
| they carry only the small currents of control circuits. |
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Term
| The most direct way to sense the motor winding temperature is with.... |
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Definition
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Term
| A pressure switch that contains a high low switch is called a... |
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Definition
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Term
| Motor controls are used... |
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Definition
to connect an disconnect motors from supplies;
as a means of protecting motors from overloads;
to determine when a motor should run or stop. |
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Term
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Definition
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Term
| Current is measured with an... |
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Definition
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Term
| Resistance usually is measured with an... |
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Definition
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Term
| A voltmeter is connected to a circuit... |
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Definition
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Term
| An in-line ammeter must be connected to the circuit... |
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Definition
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Term
| An ohmmeter must never be connected to an... |
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Definition
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Term
| When checking an electric circuit it is important to know... |
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Definition
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Term
| Digital meters have become popular because... |
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Definition
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Term
| The clamp-on ammeter is the most popular type of ammeter because... |
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Definition
| it is the easiest type to use. |
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Term
| The meter that reads V and resistance is called a... |
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Definition
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