# Shared Flashcard Set

## Details

Physics Final
Electricity, Heat, Magnets, Circuits
43
Physics
12/14/2011

Term
 Silver and copper are good ________
Definition
 Conductors
Term
 What explains the relationship between current, voltage, and resistance?
Definition
 Ohm's Law
Term
 What unit describes the difference in electrical potential between two points in a circuit?
Definition
 Volt
Term
 What is the unit for current?
Definition
 Ampere
Term
 What is the unit for resistance?
Definition
 Ohm
Term
 An electric current contains a 12 volt battery, a light bulb with 24 ohms resistance, and a switch in a series. When the switch is closed, what will be the current in the circuit?I= V/R
Definition
 1/2 amps
Term
 The electrical charge on an electron compared to the charge on a proton.
Definition
 equal in magnitude and opposite in sign
Term
 What material is the best conductor of electrical current?
Definition
 Silver
Term
 On what scale does water freeze at 0 degrees and boils at 100 degrees?
Definition
 Celsius scale
Term
 What is the measure of the average kinetic energy of the molecules in a substance?
Definition
 temperature
Term
 What is the state of matter that expands to fill the available volume?
Definition
 Gas
Term
 What is the heat transfer by the direct contact of particles of matter?
Definition
 conduction
Term
 What is the amount of heat needed to raise the temperature of 1 kg to a substance of 1 degree Celsius?
Definition
 Specific heat
Term
 A gasoline engine operates between the temperatures of 500K and 300K. What is the ideal efficiency?
Definition
 (500-300)/ 500 = 200/500 = 40%
Term
 Iron has a higher melting point than water because:
Definition
 Iron has stronger intermolecular forces
Term
 Which of the following materials is the best conductor of heat?coopersteelwodconcrete
Definition
 copper
Term
 (true or false) the natural direction of heat transfer is from a warmer object to a cooler object.
Definition
 true
Term
 What exists when there is an excess of one type of charge on an object?
Definition
 Static electricity
Term
 What explains the relationship between electric force, charge, and distance?
Definition
 Coulomb's law
Term
 What is the unit of electrical charge?
Definition
 coulomb
Term
 What is a device used to demonstrate the force between electrical charges?
Definition
 electroscope
Term
 What is one coulomb of charge passing a point in one second?
Definition
 ampere
Term
 Silver and cooper are good conductors because:
Definition
 they have free electrons
Term
 What happens to the force between two electrons if the distance between them is tripled?
Definition
 reduce to 1/9
Term
 Like charges _______ and unlike charges _______.
Definition
 repel;attract
Term
 A battery provides 8 joules of energy to 2 coulumbs of charge in a circuit? What is the batterys voltage?
Definition
 4 volts
Term
 What is a material with no free electrons through which current does not flow?
Definition
 insulator
Term
 What is used to convery mechanical energy into electrical energy?
Definition
 electric generator
Term
 What explains the relationship between the current created in a coil and the rate of change of the magentic field through the coil?
Definition
Term
 What is a device used to step up or step down the voltage of an electric circuit?
Definition
 transformer
Term
 A transformer has 100 turns of wire on the primary input side and 600 turns on the secondary side. If the input voltage is 120 volts, what is the output voltage?
Definition
 120 x 6 = 720 volts
Term
 Which of the following will increase the strength of a magnetic field around a wire carrying a current?increase the currentdecrease the distance from the wireboth answers
Definition
Term
 Like magnetic poles ________ and unlike poles ________
Definition
 repel;attract
Term
 When a coil of wire is moved in a magnetic field, there is a force that opposes this motion. What is the source of this force?
Definition
 the magnetic field around the coil of wire produced by the induced current
Term
 (true or false)if a bar magnet is cut in half, one half will be a north pole and the other half will be a south pole.
Definition
 false
Term
 What is a circuit which contains multiple paths for the current?
Definition
 parellel circuit
Term
 What kind of electricity enters your house?
Definition
 alternating current
Term
 What is the eceltrcity produced by a battery?
Definition
 direct current
Term
 What is all the current entering a branch point must leave that point?
Definition
 Krichhoffs current law
Term
 What is the unit used by electric companies to measure the amount of electrical energy your home uses?
Definition
 kilowatt-hour
Term
 In a parallel circuit, if a light is turned off, the current in the circuit ________
Definition
 decreases
Term
 In a series circuit, if a light is turned off, the current in the circuit ________
Definition
 goes to zero
Term
 (true or false)the current at every point in a parallel circuit is the same
Definition
 false
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