Electricity and Magnetism – Flashcards
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If an atom loses electrons, it becomes a
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b. positively charged ion
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The strength of an electric field depends on the
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d. both a and b
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If the two charges represented in Figure 20-1 were brought near each other, they would
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a. attract each other
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What is the SI unit of electric charge?
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d. coulomb
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Walking across a carpet is an example of charge being transferred by
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c. static electricity d. friction
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If a neutral metal comb is held near an object with a negative charge, the comb will become charged by
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a. induction
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What type of current is used in a battery?
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c. direct current
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The type of current in your school is mostly
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b. alternating current
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Which of the following materials allows charges to flow easily?
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c. an electrical conductor
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An electrical insulator has
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d. electrons tightly bound to its atoms
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Resistance is affected by a material's
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d. all of the above
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Which of the following would reduce the resistance of a metal wire?
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d. all of the above
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What is the difference in electrical potential energy between two places in an electric field?
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c. potential difference
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Which of the following is maintained across the terminals of a battery?
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d. both A and B
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The current in a clothes iron measures 5.0 amps. The resistance of the iron is 24 ohms. What is the voltage?
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a. 120 V
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Which of the following represents Ohm's law?
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b. V = I x R
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How many paths through which charge can flow would be shown in a circuit diagram of a series circuit?
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a. one
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Most of the circuits in your home are
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b. parallel circuits or d.
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What is the unit of electric power?
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c. watt
