The heat produced by a 100 W heater in 2 min. is equal to

Question

The heat produced by a 100 W heater in 2 min. is equal to (A) 10.5 kcal (B) 16.3 kcal (C) 2.8 kcal (D) 14.2 kcal.

Tardigrade Admin · Accepted Answer

Given: Power of heater (P)=100 W and time (t)=2 min =120 sec. We know that work done to produce heat (W)=P × t=100 × 120=12000 J =(12000/4 ⋅ 2 × 1000)=2 ⋅ 8 kcal

Q. The heat produced by a $100 W$ heater in $2 min$ . is equal to

10.5 kcal

16.3 kcal

2.8 kcal

14.2 kcal.

Given: Power of heater $(P) = 100 W$ and time $(t) = 2 min = 120 sec$ . We know that work done to produce heat $(W) = P \times t = 100 \times 120 = 12000 J$
$= \frac{12000}{4 \cdot 2 \times 1000} = 2 \cdot 8 k c a l$

Q. The heat produced by a 100W heater in 2min. is equal to