A lamp (R = 151 ), an electric heater (R = 24 ), and a fan (R = 49 ) are connected in parallel across a 121 V line. What total current is supplied to the circuit? What is the voltage across the fan? What is the current in the lamp? What power is expended in the heater?

Answer 1

Il = V/R = 121 v./ 151 ohm = 0.80 A

Ih = 121 / 24 = 5.04 A.
Ph = VI = 121 * 5.04 = 609.8 W.

If = 121 / 47 = 2.47 A.

It = 0.80 + 5.04 + 2.47 = 8.3 A.