Resistance of carbon filament lamp as the applied voltage increases.
A. Increases
B. Decreases
C. Remains same
D. None of the above
Answer: Option B
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The resistance will be higher at higher voltages. The filament lamp does not follow Ohm's Law. Its resistance increases as the temperature of its filament increases. So the current flowing through a filament lamp is not directly proportional to the voltage across it.
The resistance of a filament lamp increases as the potential difference increases because the filament becomes hot. The movement of electrons (the current) makes the atoms inside the filament vibrate faster and this makes the filament heat up.
The resistance of a filament lamp increases as the potential difference increases because the filament becomes hot. The movement of electrons (the current) makes the atoms inside the filament vibrate faster and this makes the filament heat up.
The resistance will be higher at higher voltages. The filament lamp does not follow Ohm's Law. Its resistance increases as the temperature of its filament increases. So the current flowing through a filament lamp is not directly proportional to the voltage across it.
The resistance of a filament lamp increases as the potential difference increases because the filament becomes hot. The movement of electrons (the current) makes the atoms inside the filament vibrate faster and this makes the filament heat up.