Question

Calculate the heat developed in the heater A and B :

(Heater A)
Working voltage: 230\V
Resistance : 1150ohms
Working time : 5 minutes

(Heater B)
Working voltage : 230\V
Resistance : 460ohms
Working time : 5 minutes

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Answer 1

Answer:I=v/r

Explanation:Heater A:I=230/1150=0.2

Heater B:I=230/460=0.5

In heater A and B, I increase H increases.

Answer 2

Answer:

HEATER A = 13800J = 13.8 KJ

HEATER B = 34500J = 34.5 KJ

Explanation:

HEATER A

heat produced = I²RT = v²t/r = 230 × 230 × 300/ 1150 = 13800J

HEATER B

heat produced = I²RT = v²t/r = 230 × 230 × 300/ 460 = 34500J

(t = 5minutes = 300 seconds)