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Transcript
P14 Electromagnetic effects Can you……? 14.1 Electromagnetic induction 1 Describe an experiment that shows that a changing magnetic field can induce an e.m.f. in a circuit. 2 State the factors affecting the size of an induced e.m.f. 14.2 a.c. generator 1 Describe a rotating-coil generator and the use of slip rings. 2 Sketch a graph of voltage output against time for a simple a.c. generator. 14.3 Transformer 1 Name the parts of a transformer 2 Remember and use the equation Vp/Vs = Np/Ns 3 Describe the use of the transformer in high-voltage transmission of electricity. 4 Remember and use the equation VpIp = VsIs (for 100% efficiency). 5 Explain why energy losses in cables are lower when the voltage is high. 14.4 The magnetic effect of a current 1 Describe the pattern of the magnetic field around a straight wires and in solenoids (coils). 2 Describe the effect on the magnetic field of changing the size and direction of the current. 3 Describe how an electric bell and relay work. 14.5 Force on a current-carrying conductor 1 Describe an experiment to show that a force acts on a current-carrying wire in a magnetic field. 2 Use Fleming’s left-hand rule to predict the directions of force, field or current. 14.6 d.c. motor 1 Describe the turning effect on a current-carrying coil in a magnetic field. 2 Relate this turning effect to the action of an electric motor. 3 Describe the effect of increasing (a) the number of turns in the coil (b) the current. USE THIS SHEET TO HELP YOUR REVISION!