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Electrical safety

Explain how electric current generates heat.

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90 min

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CambridgeIGCSECombined ScienceElectricity

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Electrical safety outcomes4 objectives

Explain how electric current generates heat.
Identify the dangers associated with: (a) damaged insulation (b) overheating of cables (c) wet environments (d) excessive current due to overloaded plugs, extension leads, and sockets when connected to mains power.
Describe how trip switches and fuses function, and select suitable fuse ratings and trip switch settings (knowledge of RCDs is not included).
Discuss the necessity for the outer casing of electrical devices to be either non-conductive (double-insulated) or connected to the earth.

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