Question

The electric circuit (above figure) in a clothes dryer contains two heaters X and Y in parallel. The above figure shows the circuit connected to a 230 V power supply. When both switches are closed, the current in X is 3.5 A.

Analyse the circuit given above and answer the following questions.

(i) Calculate the power developed in heater X.

(ii) If the resistance of X is double that of Y calculate the current in heater Y. O

Answer 1

(i) P = VI 

= 230 × 3.5 = 805 W

(ii) I \(\propto \frac{1}{R}\), so half the resistance means double the current.Therefore, current in Y = 7.0 A.