Physics
posted by Priscilla .
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
 Ok, i understand some of this. For the six lamps turned on is 0.5 A. For the four lamps turned on, would i divide 240/4 = 60 and then find the current.
 Thanks a lot and have a good weekend.

yes, don't forget about the heater, it draws 10 amps when on.
Respond to this Question
Similar Questions

Physics
Thanks for any help :) Four 20 ohm resistors are connected in parallel and the combination is connected to a 20V emf device. The current is: A) 0.25A B) 1.0 A C) 4.0 A D) 5.0 A E) 100 E Parallel circuits: I know that the voltage is … 
physics
A 16.0 ohm and a 24.0 ohm resistor are connected in parallel. A difference in potential of 32.0 V is applied to the combination. What is the equivalent resistance of the parallel circuit? 
Physics
A 22ohm resistor and a 33ohm resistor are connected in series and placed across 120V potential difference. 1. what is the equivalent resistance of the circuit? 
Physics
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 … 
physics.
resistors of 30 ohms and 60 ohms are connected in parallel and joined in series to a 10 ohm resistor. the circuit voltage is 180 volts I need to find 1)the voltage of the parallel circuit 2)the resistance of the complete circuit 3)the … 
physics
resistors of 30 ohms and 60 ohms are connected in parallel and joined in series to a 10 ohm resistor. the circuit voltage is 180 volts I need to find 1)the voltage of the parallel circuit 2)the resistance of the complete circuit 3)the … 
physics
resistors of 30 ohms and 60 ohms are connected in parallel and joined in series to a 10 ohm resistor. the circuit voltage is 180 volts I need to find 1)the voltage of the parallel circuit 2)the resistance of the complete circuit 3)the … 
physics  need help
Resistors of 30 ohms and 60 ohms are connected in parallel and joined in series to a 10 ohm resistor. The circuit voltage is 180 volts. Find: the voltage of the parallel circuit the voltage across the parallel circuit the current through … 
physics
Please check my work here: Resistors of 30 ohms and 60 ohms are connected in parallel and joined in series to a 10 ohm resistor. The circuit voltage is 180 volts. Find: a)the voltage of the parallel circuit b)the voltage across the … 
Physics
A circuit contains six 270 lamps and a 18.0 heater connected in parallel. The voltage across the circuit is 120 V. (a) What is the current in the circuit when four lamps are turned on?