The resistance of a filament that carries 2 A when a 10-V potential difference across it is
A)2 ohms.
B)5 ohms.
C)10 ohms.
D)20 ohms.
E)more than 20 ohms.

Question

Quizplus · Accepted Answer

The resistance of the filament can be calculated using Ohm's Law: R = V/I, where V is the voltage, I is the current, and R is the resistance. 
So, R = 10 V / 2 A = 5 ohms. 
Therefore, the best choice is B, 5 ohms.

The Resistance of a Filament That Carries 2 a When