Gina examines the equations for electric power and Ohm's law. She thinks that there is a third equation that can calculate power using only voltage and resistance. Which statement best evaluates Gina’s idea?
Answer
A
It is incorrect, because Ohm’s law does not include cap i squared .
B
It is correct, because cap i is equal to cap v over cap r .
C
It is incorrect, because both equations for power use current.
D
It is correct, because cap i is equal to cap r over cap v .
Explanation
Ohm’s law gives current as I = V/R. Substituting that into the power equation P = VI gives P = V(V/R) = V²/R, so power can be calculated using only voltage and resistance. Choice B correctly states that I = V/R.
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