One of the following is an Ohmic device:
Correct answer: D. Copper wire
- A. Filament bulb
- B. Semiconductor diode
- C. Transistor
- D. Copper wire
Explanation
An Ohmic device has a constant resistance, meaning its V-I graph is a straight line. Of the options, a simple copper wire most closely follows Ohm's law under normal conditions. Filament bulbs, diodes, and transistors are all non-ohmic.
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Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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