1) Electric current created chemically is always… a) Alternating b) Large c) Direct 2) What is the main voltage value in this country? a) 230V b) 500V c) 13V 3) What is the frequency of the UK mains? a) 50Hz b) 5Hz c) 500Hz 4) What is the entire system called that links powers stations and transmission lines to consumers? a) Generators b) Transformers c) The National Grid 5) A step-down transformer… a) Lowers the current and lowers the voltage b) Increases the current and lowers the voltage c) Lowers the current and increases the voltage 6) Mains electricity in the UK uses? a) Direct current b) Alternating current c) Both direct current and alternating 7) The device shown in the diagram is. a) an oscilloscope b) an ammeter c) a voltmeter 8) A light bulb works just as well with an alternating current as it would with a direct current. a) True b) False 9) A typical power station generates electricity at an alternating potential difference of about.. a) 25 000 V b) 250 000 V c) 250 V 10) What type of transformers are used in the National Grid? a) Both step-up and step down transformers b) Only step up transformers c) Only step down transformers

Mains electricity and Current Quiz

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