Question

The approximate value of heat produced in 5 min. by a bulb of 210 watt is (J = 4.2 joule/calorie)

• A. 15,000
• B. 1,050
• C. 63,000
• D. 80,000

Answer 1

Answer: (A)

15,000

Answer 2

By using $H = \frac{P \times t}{4.2} = \frac{210 \times 5 \times 60}{4.2} = 15000Cal$