Students should be able to: use circuit diagrams to construct and check series and parallel circuits that • include a variety of common circuit components describe the difference between series and parallel circuits • explain qualitatively why adding resistors in series increases the total • resistance whilst adding resistors in parallel decreases the total resistance explain the design and use of dc series circuits for measurement and testing • purposes calculate the currents, potential differences and resistances in dc series • circuits problems for circuits which include resistors in series using the concept of • equivalent resistance. Students are not required to calculate the total resistance of two resistors joined in parallel. 4.2.3 Domestic uses and safety 4.2.3.1 Direct and alternating potential difference electricity is an ac supply. In the United Kingdom the domestic electricity 34 28 36, 166 supply has a frequency of 50 Hz and is about 230 V. Students should be able to explain the difference between direct and alternating potential difference. 4.2.3.2 Mains electricity Most electrical appliances are connected to the mains using three-core cable. 34 29 36, 167 The insulation covering each wire is colour coded for easy identification: live wire brown – neutral wire blue – earth wire green and yellow stripes. –
Students should be able to: • use circuit diagrams to construct and check series and parallel circuits that include a variety of common circuit components • describe the difference between series and parallel circuits • explain qualitatively why adding resistors in series increases the total resistance whilst adding resistors in parallel decreases the total resistance • explain the design and use of dc series circuits for measurement and testing purposes • calculate the currents, potential differences and resistances in dc series circuits • problems for circuits which include resistors in series using the concept of equivalent resistance. Students are not required to calculate the total resistance of two resistors joined in parallel. 4.2.3 Domestic uses and safety 4.2.3.1 Direct and alternating potential difference electricity is an ac supply. In the United Kingdom the domestic electricity supply has a frequency of 50 Hz and is about 230 V. Students should be able to explain the difference between direct and alternating potential difference. 34 28 36, 166 4.2.3.2 Mains electricity Most electrical appliances are connected to the mains using three-core cable. The insulation covering each wire is colour coded for easy identification: live wire – brown neutral wire – blue earth wire – green and yellow stripes. 34 29 36, 167
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