c) Fixed resistors/lamps
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state the I-V characteristics of a fixed resistor (regardless of the polarity)
potential difference → directly proportional to the current
ohmic conductor
resistance = constant
2
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state the I-V characteristics of a filament lamp (regardless of the polarity)
potential difference → not directly proportional to the current
non-ohmic conductor
resistance = increasing
3
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describe how a high current in a filament lamp causes a high resistance
more electrons
→ more collisions with the positive ions
→ electrons and positive ions have more kinetic energy
→ higher temperature
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