Describe a simple experiment to show that the bulb lights up when an electric circuit is complete and vice-versa

cbse
cbse-class-7-science
electric-current-eff

#1

Describe a simple experiment to show that the bulb lights up when an electric circuit is complete and vice-versa.

Answer:

  • Take a dry cell, a small torch bulb (fitted with a holder) and a copper connecting
  • wire.
  • Connect the dry cell, the bulb and the copper wire as shown below.
  • Leave a gap in this connection and mark it as AB.
  • Due to the gap AB the electric circuit is not complete and therefore the bulb does not glow.
  • Take a pencil and fit it in the gap AB. You will find that the bulb glows as the circuit is complete.
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