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- 1. Multiple ChoiceThe frequency of mains electricity in the uk is ___hz (cycles per second)50windspecificBrakingresolving
- 2. Multiple ChoiceMains electricity uses _______________(name) current.alternatingwavesolidConservedvoltage
- 3. Multiple ChoiceU.K. Mains = _________V230unreliableradiationDirectly proportionalUse the formula to work out the current for a microwave with a 230V@ 690W rating. ______ A (do not include the unit).
- 4. Multiple ChoiceA battery supplies _______________ current to an appliance.DirecttidalPowerElasticup
- 5. Multiple ChoiceThe fuse _______________ when there is too much current flowing through the circuit.meltsstartMetalsExtensiontransformers
- 6. Multiple ChoiceWhat colour is the live wire?BrownsolarmassInertiaPower
- 7. Multiple ChoiceWhat colour is the neutral wire?Blueshortestloft insulationproportionalityplastic
- 8. Multiple ChoiceThe ____________ wire is green and yellowearthrenewableliquidMassnational grid
- 9. Multiple Choice
All appliances with a __________ case need a 3 core cable containing live@ neutral and earth wires.
metal
nuclear
Joules
Momentum
glass
- 10. Multiple ChoiceThe pins on a plug are made out of _____________ because it is a good conductor and it doesn't rust or oxidiseBrassnonmaintenanceStoppingmelts
- 11. Multiple ChoiceA ____________________ case stops someone from getting an electric shock when they touch the appliance (even if the live wire touches the case). These appliances do not need an earth wire and often use a 2 core cable.plasticneutralhydroelectricTerminal velocityheats
- 12. Multiple ChoiceA giant system of cables and transformers distributes electricity around the country. This is called the ______________ ____________.national gridnaturalgridThinkingFrequency
- 13. Multiple ChoiceA step __________ transformer reduces the potential difference (for safety) which increases the current.downmaintenancegasWeightearth
- 14. Multiple ChoiceWe use ________________________(plural) to reduces energy losses (as heat) during transmission. Higher currents transfer more energy as heat along the cable.transformershydroelectricevaporationresultantdown
- 15. Multiple ChoiceA step _______ transformer Increases the potential difference which decreases the current ( lower current less energy wasted).upgridEmittingaccelerationDirect
- 16. Multiple ChoiceWall sockets are connected in parallel. This is because each branch in a parallel circuit will have the same _______________.voltagegeothermaldifferenceN/kgBrown
- 17. Multiple ChoiceWhen current flows through a resistor it ________up.heatsExample: biomass, geothermal, hydropower, solar, windconductormaintenancealternating
- 18. Multiple Choice________________________ = current x potential differencePowerelectricalconductionhydroelectric60W
- 19. Multiple ChoiceCalculate the power for a 12V@ 5A light bulb.60Wcrudeconductiongrid5A
- 20. Multiple ChoiceWhich fuse would you use for an electric mixer which uses a current of 4A.5A3Agridgrid50
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