• Electrical Quantities
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  • The Figure shows a circuit containing a battery of electromotive force (e.m.f.) 12V and a heater of resistance 6.0 Ω. Calculate the current in the heater.
    2.0 A
  • The Figure shows a circuit. The two lamps shown are identical. Each lamp has a potential difference (p.d.) of 3.0 V across it and a current of 2.0 A in it. PQ is a length of uniform metal wire. The resistance of PQ is R.
    2.3 Ω
  • What is an electric field?
    Region around a charged object where another charge experiences a force.
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