question_answer 13)

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

Answer:

Here, potential difference, V = 220 V Resistance of each coil, r = 24 (i) When each of the coils A or B is connected separately, current through each foil, i.e., I =   (ii) When coils A and B are connected in series, equivalent resistance in the circuit, Rs = r + r = 2r = 48 Current through the series combination, ie., Is =   (iii) When the coils A and B are connected in parallel, equivalent resistance in the circuit, Rp = Current through the parallel combination, ie., Ip =