If both the current and the voltage in a circuit are doubled, the power
(a) remains unchanged if the resistance is constant.
(b) is halved.
(c) is doubled.
(d) is quadrupled.
The essential physics concept in an electric generator is
(a) Coulomb’s law.
(b) Ohm’s law.
(c) Faraday’s law.
(d) Newton’s second law.
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