Overview
A direct-current circuit comprises two resistors, ‘A’ of value 25 ohmsand ‘B’ of unknown value, connected in parallel, together with a third resistor ‘C’ of value 5 ohms connected in series with the parallel group. The potential difference across C is found to 90V. If the total power in the circuit is 420W, calculate:
a) The value of resistor B.
b) The current in each resistor.
c) The voltage applied to the ends of the whole circuit.