Question

What is the ratio of heat generated in R and 2R

• A. 2 : 1
• B. 1 : 2
• C. 4 : 1
• D. 1 : 4

Answer 1

Answer: (A)

2 : 1

Answer 2

Both R and 2R in parallel ( V – constant)

So using $P = \frac{V^{2}}{R}$ ⇒ $\frac{P_{1}}{P_{2}} = \frac{R_{2}}{R_{1}}$ ⇒ $\frac{H_{1}}{H_{2}} = \frac{R_{2}}{R_{1}} = \frac{2}{1}$