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| 1. What is the name of the current that flows in one direction? |
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| 2. What do we call current that flows back and forth? |
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| 3. What do we call the rate at which energy is transferred by electric current? |
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| 4. Temperature flows when there is a difference in temperature. Charge flows when there is a difference in ____________ potential. |
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| 5. What do we call the flow of electric charge? |
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| 6. What do we call electrons that carry the charge throughout the network? |
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| 7. Electric current is measured _____ ___________. |
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| 8. What does the symbol A stand for? |
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| The flow of 1 coulomb/second |
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| 10. What is the unit of charge? |
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| 11. Does a current-carrying wire have a net electric charge? |
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| No. The number of electrons entering one end is the same number of electrons leaving the other end. |
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| 12. In an electric circuit, what provides the potential difference, voltage source or electric pump? |
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? Dry cells or Wet cells → A battery is two or more cells, these are DC sources
Generators – AC source |
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| 13. What is the electric pressure across an average outlet? |
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| 14. What does 120 volts mean? (I want extremely descriptive units) |
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| 120 joules/coulomb. So each coulomb has 120 joules of energy |
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| 15. What does 120 joules mean? (I want extremely descriptive units) |
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| 120 N•m. The force of 120 Newtons is exerted for 1 meter in the direction of flow. |
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| 16. The resistance of a material to the flow of electric current through it is measured in ______________________. |
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| 17. More or Less. Thick wires have ________ resistance than thin wires. |
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| 18. More or Less. Longer wires have ________ resistance than shorter wires. |
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| 19. State Ohm’s Law, and then give me units for each symbol. |
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| I=V/R; amperes = volts/ohms |
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| 20. What causes electric shock in the human body – current or voltage. |
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| 21. Why don’t birds get electrocuted when they land on a high-voltage wire? |
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| The whole body is at one voltage. There is no difference in voltage across their body. |
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| 22. What portion of an appliance is connected to the ground wire? |
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| Outside surface of appliances are connected to the grounding prong of the plug. |
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| 23. What is the frequency of North American Alternating current? |
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| 60 Hz, one cycle occurs every 1/60 sec |
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| 24. Name a tiny electronic device that restricts current to flow in a single direction in an electric circuit. |
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| 25. Do electrons move close to the speed of light when a circuit is completed? |
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| No, the electrons do not move as fast as the signal. |
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| 26. The rate at which electrical energy is converted into another form of energy (mechanical, heat, light) is called electric ________________. |
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| 27. Give me an equation for electric power. |
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| . P=IV Power = current x voltage |
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| 28. What are the units of electric power? |
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| 29. What is the unit of watt? |
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| 30. In a locality where energy costs 5 cents/kilowatt•hour, how much does it cost to burn a 100 watt light bulb for 24 hours? |
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| 100 watt •($.05/kilowatt•hour)•(24 hours)•(1 kilowatt/1000watts) = $.12 |
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| 31. How much power is used by a calculator that operates on 8 volts and .1 amp? If it is used for 1 hour, how much energy does it use? |
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P = IV = (.1amp)(8 volts) = .8 watts Energy is in kilowatt•hour so
Energy = (.8 watts) (1 Hour) = .8 watts • hr = .0008 kilowatts• hour |
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| 32. What current will flow through a 1200 watt appliance operating on a 120 volt line? |
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| P = IV, 1200 watts = I (120 Volts); I = 10 amperes |
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