Correct Answer - Option 4 : 19.32 kWh
CONCEPT:
Heating effect of electric current:
When a current is flowing in a circuit having resistance there is a heat dissipation due to the resistance. This is called the heating effect of electric current.
The Heat dissipated (H) is given by:
H = I2Rt .... (1)
Where I = the current flowing in the circuit, R = the resistance of the circuit, and t = the time taken
According to Ohms law,
V = IR .... (2)
From equation (1) and (2)
\(H=VIt\)
EXPLANATION:
Given that:
I = 7 A
V = 230 V
t = 12 h
Hence, Energy consumed or heat dissipate is given as,
H = 230 × 7 × 12 = 19320 Wh = 19.32 kWh