Which of the following can be used in a tester along with a battery to detect a weak current in the circuit
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• By using a LED. Even when we pass a weak current, LED glows.
Lead pieces are attached to an LED.
One lead is longer than the other leads.
While connecting LED in the circuit, the long head is connected to the positive terminal of the battery in all cases.
• By using a compass:
Weak electric current flowing through a liquid can also be detected by using a compass.
We take out the cardboard tray from the inside of a discarded matchbox and place a small compass inside this cardboard tray.
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Answer:
• By using a LED. Even when we pass a weak current, LED glows.
Lead pieces are attached to an LED.
One lead is longer than the other leads.
While connecting LED in the circuit, the long head is connected to the positive terminal of the battery in all cases.
• By using a compass:
Weak electric current flowing through a liquid can also be detected by using a compass.
We take out the cardboard tray from the inside of a discarded matchbox and place a small compass inside this cardboard tray.
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