two devices to detect a weak flow of current
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Galvanometer....and Ammeter...
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The current flowing in a circuit is usually detected by using a small electric bulb.
When an electric current flows through a bulb then due to the heating effect of current, the filament of bulb gets heated to a high temperature, becomes white hot and glows to produce light.
When the current flowing through a circuit is large ,the heating effect is large due to which the bulb glows brightly.
When the current flowing through the circuit is small, the heating effect is also small, due to which the bulb glows dimly. 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.
A torch bulb cannot be used to detect weak electric current flowing through a liquid in the circuit.
When an electric current flows through a bulb then due to the heating effect of current, the filament of bulb gets heated to a high temperature, becomes white hot and glows to produce light.
When the current flowing through a circuit is large ,the heating effect is large due to which the bulb glows brightly.
When the current flowing through the circuit is small, the heating effect is also small, due to which the bulb glows dimly. 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.
A torch bulb cannot be used to detect weak electric current flowing through a liquid in the circuit.
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