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A circuit consists of a battery, a metal wire, an ammeter and a switch connected in series. The switch is closed and the ammeter reading noted. The metal wire is now heated.

  1. State the observation made on the ammeter reading and give a reason for your answer 
  2. State the purpose of a fuse in a circuit. 
  3. An electric heater is made of wire of resistance 100Ω and 2400 V mains supply. Determine
    • Power rating of the heater 
    • Current flowing in the circuit 

1 Answer

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  1. The ammeter reading decreases. The resistance of the metals decreases with increase in temperature.
  2. A fuse open/breaks an electric circuit when current flow exceeds certain amount. 
    • P= v2/R = 2402/100=     576W 
    • I= p/v = 576/240
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