The potential difference across the mains power supply in the UK is

1Which of the following best describes the UK mains electricity supply?50 V, 230 Hz a.c.230 V, 50 Hz d.c.50 V, 230 Hz d.c.230 V, 50 Hz a.c.2In a three-core electricity cable, which of the following wires is covered by green and yellow plastic?The neutral wireThe earth wireThe fuse wireThe live wire3Under normal operating conditions, which of the wires in a three-core cable carry an electric current?The live and earth wires onlyThe neutral and earth wires onlyThe live and neutral wires onlyThe live wire only4An electric kettle is labelled as having double insulation.  Which electrical wire will be missing from its power cable?NeutralEarthLiveIt’s a trick question – the kettle will require all three wires to operate5Which of the following types of electrical wires poses the greatest safety risk, especially when frayed or damaged?NeutralLiveEarthAll electrical wires pose the same risk to safety6A television is connected to the mains supply using a three-core cable.  Where in this circuit should the protective fuse be placed?Along the live wireInside the televisionAlong the earth wireAlong the neutral wire

A power supply which has voltage regulation of ……….. is unregulated power supplyA. 0 %B. 5 %C. 10 %D. 8%

What three voltages are commonly provided by the power supply to the various components inside the computer?

What is potential difference

What type of power supply is typically used for a PLC?