Question

The heat produced by 1500 W heater in 14 min when used is

• A. 3.0 kcal
• B. 30.0 kcal
• C. 300 kcal
• D. 3000 kcal

Answer 1

Answer: (C)

Heat produced $=\frac{Pt}{J}$ $=\frac{1500\times 14\times 60}{4.2}\text{cal}$ $=\frac{1500\times 14\times 60}{1000\times 4.2}\text{kcal}$ $=300\text{kcal}$