Question

Solve the following problem.

The heating element connected to 230V draws a current of 5A. Determine the amount of heat dissipated in 1 hour (J = 4.2 J/cal.).

Answer 1

Given: V = 230 V, I = 5 A, Δt = 1 hour = 60 × 60 sec

To find: Heat dissipated (H)

Formula: H = ΔU = IΔtV

Calculation: From the formula,
H = 5 × 60 × 60 × 230
= 4.14 × 10⁶ J
Heat dissipated in calorie,
H = `(4.14xx10^6)/4.2` = 985.7 × 10³ cal
= 985.7 kcal

The amount of heat dissipated in 1 hour is 985.7 kcal.