Question

17 Which equation is used to define resistance?
A) Energy = (current)2 x resistance x time
B) Potential difference = current resistance
C) Power = (current)2 x resistance
D) Resistivity = resistance x area ÷ length
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Answer 1

Answer:

Answer is (B)

Explanation:

Resistance is defined as the ratio of potential difference applied across a conductor to the current that flows through the conductor.

By Ohm's Law,                           R=V/I

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Answer 2

Which equation is used to define the resistance.

A) Energy = (current)² × resistance × time

B) potential difference = current × resistance

C) Power = (current)² × resistance

D) Resistivity = resistance × area ÷ length.

Answer : option (B) potential difference = current × resistance.

Explanation :

Definition of resistance : “The resistance of a conductor is defined as the ratio of potential difference across it to the current flowing through it.”

i.e., R = V/I

hence, Resistance = potential difference/current

⇒potential difference = current × resistance

Therefore option (B) defines the resistance of a conductor.