Question

Why can't a torch bulb be used to detect weak electrical current flowing through a liquid in a circuit​

Answer 1

Answer:

If the current flowing through the circuit is too weak, then the heating effect produced by current in the filament is too little, due to which the filament does not get heated sufficiently and hence the bulb does not glow at all.

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Answer 2

If the current flowing through the circuit is too weak, then the heating effect produced by current in the filament is too little, due to which the filament does not get heated sufficiently and hence the bulb does not glow at all.