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Resistors and Lights

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Nameo | 21:47 Sun 12th Feb 2006 | Science
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How is that in an electrical circuit a light bulb and a resistor can behave in the same manner but have different resistance values?
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Avatar Image gen2

A resistor and a light bulb both have resistance and so both will impede the current. The exact resistance will depend upon what material each is made of, its thickness, its initial temperature and its ability to lose any heat generated. If the temperature is maintained at a constant value, then the resistance will remain constant. If the temperature rises, then so will the resistance.


00:25 Mon 13th Feb 2006
Avatar Image gen2

. . . and the resistance also depends upon the length of the resistor.


00:26 Mon 13th Feb 2006
Avatar Image mibn2cweus
The resistance of the light bulb will measure much lower when no current is flowing through it. When a light bulb is illuminated its resistance increases considerably. If the voltage measured across a resistor and a light bulb connected in series in a live circuit is the same they have the same operating resistance
03:30 Mon 13th Feb 2006
Avatar Image elginsmarble
Resistance = Resistivity x Length / Area
15:23 Mon 06th Mar 2006

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