posted by Priscilla on .
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.
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