Give one use for electricity in the home., List three effects of an electric current., Describe an experiment that demonstrates the heating effect of an electric current., State two factors on which the heating effect of an electric current depends., Describe how you would demonstrate the magnetic effect of an electric current., Explain why high voltages are used in the transmission of electrical energy., Suggest a method of reducing the energy “lost” in ESB power lines., Name two safety devices that are used in domestic electric circuits., What is the colour of the earth wire in an electric cable?, What is the colour of the wire that should be connected to the fuse in a plug?, Name and give the colour of the wire that should be connected to the fuse in a standard 3-pin plug., Give one safety precaution that should be taken when wiring a plug., Explain why a fuse is used in a plug., Explain how a fuse works., What will happen when a current of 20 A flows through a fuse marked 13 A?, Why would it be dangerous to use a fuse with too high a rating?, Explain why replacing a fuse with a piece of aluminium foil is dangerous., Name a common material used to conduct electricity in electric cables., Some electrical appliances are supplied with two-pin plugs. Why is an earth wire not required in these devices?, Why is the coating on electric cables made from plastic?, A toaster has exposed metal parts. How is the risk of electrocution minimised?, Bonding is a safety precaution used in domestic electric circuits. How does bonding improve safety in the home?, Name another device with the same function as a fuse., What is the purpose of a miniature circuit breaker (MCB) in an electric circuit?, When will an RCD (residual current device) disconnect a circuit?, An RCD is rated 30 mA. Explain the significance of this current., What is the purpose of a residual current device (RCD) in an electrical circuit?, Name a device that is often used nowadays in domestic electric circuits instead of fuses., Give one advantage of a Residual Current Device (RCD) over a Miniature Circuit Breaker (MCB)., What are the charge carriers when an electric current passes through an electrolyte?, What is the kilowatt-hour?, What is the function of the ESB meter?.
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29. Domestic electricity
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