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This circuit simulation Applet was not written by me. It was written by Sean Russell, Department of Computing and Information Sciences, University of Oregon.
This circuit simulator demonstrates the principle of ohms law. Ohms law states that voltage = current x resistance. The circuit below will only work when the correct voltage is applied to the bulb. You can alter the voltage applied to the circuit by dragging the appropriate battery to the bottom left of the circuit. You can alter the resistance of the circuit by dragging the resistors into the circuit and dragging them out again. Throw the switch to test the circuit. If the voltage is too high then the bulb will blow if the voltage is too low then it will not light at all. You should be able to make the bulb work by trial and error and work out both the ohms law relationship and the appropriate voltage and current values. Further down the page and there you will find a suggested value of voltage and resistance.
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This is only one of many values which will light the bulb:
12 volt battery
4 and 2 ohms resistors
Throw the switch
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number to visit.
