Question

A circuit contains sic 60-W lamps with a resistance of 240-ohm each and a 10.0-ohm heater connected in parallel. The voltage across the circuit is 120 V. Find the current in the circuit for the following situations::::

a. four lamps are turned on
b. all of the lamps are turned on
c. six lamps and the heater are operating.

Answer 1

In each case, add the currents of all of the operating lamps and heater.

For the lamps, the current drawn by each ont that is "on" is I = V/R
= 120/ 240 = 0.5 A

For the heater, the current drawn is 120/10 = 12 A