Physics · Current Electricity
Work through this past-paper style MCQ, then read the full explanation. Practice more physics questions on mMCQ with adaptive practice and topic analytics.
Is Ohm's law applicable when a bulb is turned on?
- A
Yes
- B
No
- C
Partly
- D
None of these options are correct
Those materials for which the slope of the I versus V graph is not constant are called non-ohmic materials.
For EXAMPLE The filament of an electric bulb.
The I-V graph for non-ohmic materials is non-linear (curved).
Ohmic materials have constant resistance. When a bulb is turned on, it heats up, and its resistance increases.
Therefore, Ohm’s law is not applicable when a bulb is turned on.
Hence, B is the correct option.
If the bulb is turned on, resistance of the bulb increases with temperature which causes deviation from Ohm's Law and therefore, this option is not correct.
Those materials for which the slope of the I versus V graph is not constant are called non-ohmic materials.
FOR EXAMPLE: The filament of an electric bulb.
The I-V graph for non-ohmic materials is non-linear (curved).
Ohmic materials have constant resistance. When a bulb is turned on, it heats up, and its resistance increases.
Therefore, Ohm’s law is not applicable when a bulb is turned on.
Hence, B is the correct option.
If the bulb is turned on, the resistance of the bulb increases with temperature which causes deviation from Ohm's Law therefore, this option is not correct
If the bulb is turned on, resistance of the bulb increases with temperature which causes deviation from Ohm's Law and therefore, this option is not correct
Tagged under Physics · Current Electricity · 2021