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How does the power dissipated in a light bulbfilament vary with the applied voltage?
Member rating: No Rating | Words: | Submitted: Thu Jul 11 2002
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How does the power dissipated in a light bulb filament vary with the applied voltage? Apparatus (see later for details) Rheostat 12V Power Pack Voltmeter Filament Bulb (12V) Ammeter Several Wires 12V D.C Theory and influence of preliminary exp. To work out the power dissipated from the filament I will use the formula: P=VI (Where P = power V = voltage I = current) To find the voltage I will put a voltmeter in parallel with the light bulb, as this will measure the voltage used by the bulb and not the whole circuit (resistance of the other wires, ammeter or rheostat may cause the circuit to draw slightly more voltage than the light bulb uses). This will help to give a more accurate and reliable answer. The ammeter should be in series, but does...
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