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igcse physics notesprinted 99 · PDF 99
124 pagesrevision 46936
printed 99 · PDF 99
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99
In an ohmic conductor, the current is directly proportional to the voltage (i.e.
it has constant resistance). In a non-ohmic conductor (such as a filament
lamp), the resistance changes as the
voltage and current change.
As the current increases through a filament lamp, so does the temperature.
This means
electrons and ions vibrate more and collide more, increasing resistance.
NOTE: All these formulas can be rearranged depending on what the
question is asking