Posted by Priscilla on Friday, February 26, 2010 at 8:00am.
A circuit contains sic 60W lamps with a resistance of 240ohm each and a 10.0ohm 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.

Physics  drwls, Friday, February 26, 2010 at 8:11am
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
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