Question

A hot plate of an electric oven connected to a 220V line has two resistance coils A and B, each of 24‎Ω resistance, which may be used separately, in series or in parallel. What are the currents in the three cases?

Answer 1

Potential difference,V = 220V
Resistance of each coil, R = 24‎Ω

Case I: When coils A and B are used separately, current through each coil,​

I=V/R=220/24=9.2A

Case II: When coils A and B are connected in series, the equivalent resistance in the circuit.

Case III: When coils A and B are connected in parallel, the equivalent resistance (R_P ) is given by​