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Question

How can a small current in a circuit be detected?


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Solution

  1. Current is the flow of charge per unit time.
  2. Small currents are detected using a galvanometer in circuits.
  3. A galvanometer is used for measuring a small electric current by deflection of a moving coil.
  4. When a current passes through, it imparts a force on the rotating coil.
  5. This force causes the galvanometer to deflect, and it detects the presence of a current.
  6. Hence, when an electrical current passes through the coil a deflection occurs.

Hence a galvanometer detects a small current in a circuit.


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