Question

A current of 2 A passing through conductor produces 80 J of heat in 10 seconds. The resistance of the conductor is

• A. $0.5\Omega$
• B. $2\Omega$
• C. $4\Omega$
• D. $20\Omega$

Answer 1

Answer: (B)

$2\Omega$

Answer 2

$H = i^{2}Rt$ ⇒ $R = \frac{H}{i^{2}t} = \frac{80}{4 \times 10} = 2\Omega$