The cards Question What is the potential difference of UK mains electricity between the live and neutral connections? Tap to flip Answer 230 V. Question What colour is the live wire in a mains circuit? Tap to flip Answer Brown. Question What colour is the neutral wire in a mains circuit? Tap to flip Answer Blue. Question What is the voltage of the neutral wire in a mains circuit? Tap to flip Answer 0 V. Question What kind of current does UK mains electricity supply, and at what frequency? Tap to flip Answer Alternating current at 50 Hz. Question What is an electric shock? Tap to flip Answer A current passing through a person's body, which can be painful and sometimes harmful. Question The size of the current in an electric shock depends on which two things? Tap to flip Answer The p.d. across the person and the resistance of their skin (I = V ÷ R). Question How does the resistance of wet skin compare with that of dry skin? Tap to flip Answer Wet skin has a much lower resistance. Question Do mains appliances take their electricity from the live wire alone? Tap to flip Answer No. A complete circuit is needed, through both the live and neutral wires. Question What is a short circuit? Tap to flip Answer A complete circuit with a very small resistance, often caused by a loose wire. Question What is double insulation? Tap to flip Answer Two layers of electrical insulation, one of which is the appliance's outer casing. Question What is a fuse? Tap to flip Answer A thin wire that melts when a dangerously large current flows through it. Question In a plug, which wire is the fuse on? Tap to flip Answer The live wire. Question What does an earth wire connect? Tap to flip Answer An appliance's metal casing to the ground (0 V). Question What is a circuit breaker? Tap to flip Answer A switch turned off by an electromagnet when a dangerously large current flows through it. Question What can happen if a live wire touches the inside of a metal case? Tap to flip Answer The metal case may become live. Question When a metal case becomes live, along which wires does current flow before the fuse melts? Tap to flip Answer Along the earth wire and the live wire. Question Why are domestic circuits carrying too much current switched off by circuit breakers? Tap to flip Answer To prevent fire. Question What is power? Tap to flip Answer The amount of energy transferred each second. Question What is the unit of power? Tap to flip Answer The watt (W): one joule transferred per second. Question How many watts are in one kilowatt? Tap to flip Answer 1000 W. Question Which equation links power, current and potential difference? Tap to flip Answer Power = current × potential difference (P = I V). Question At a constant p.d., how does a larger current affect the rate of energy transfer? Tap to flip Answer It transfers energy more quickly. Question Which fuse should be chosen for an appliance? Tap to flip Answer The fuse with the smallest rating for the required current. Question Do power and energy mean the same thing? Tap to flip Answer No. A greater power means energy is transferred more quickly. Question What is the unit of electric charge? Tap to flip Answer The coulomb (C). Question What is electric current? Tap to flip Answer The amount of electric charge flowing past a point in a circuit each second (I = Q ÷ t). Question What is potential difference? Tap to flip Answer The energy transferred by each coulomb of charge passing between two points in a circuit (V = E ÷ Q). Question Combining I = Q ÷ t and V = E ÷ Q gives which equation? Tap to flip Answer E ÷ t = I × V, which is equivalent to P = I × V. Question Electric charge can have which two signs? Tap to flip Answer Positive or negative. Question What is the National Grid? Tap to flip Answer A high-voltage transmission system that carries electricity from power stations to where it is needed. Question What does a step-up transformer do in the National Grid? Tap to flip Answer It increases the voltage from a power station to the transmission line. Question What does a step-down transformer do in the National Grid? Tap to flip Answer It decreases the voltage from a transmission line to the consumer. Question How do transmission lines lose some energy? Tap to flip Answer By heating (P = I²R). Question Why do transmission lines use a very high voltage? Tap to flip Answer It reduces the current, which reduces the heating of the lines. Question What is dissipation? Tap to flip Answer The transfer of energy into the surroundings by heating. Question Is the voltage drop along a power line the same as the voltage it transmits? Tap to flip Answer No. Power transmitted depends on the p.d. between live and neutral; power lost depends on the drop along the live wire. Question What is a renewable energy resource? Tap to flip Answer One that can be replenished as quickly as it is used, or will not run out. Question What is a non-renewable energy resource? Tap to flip Answer One that cannot be replenished as quickly as it is used and will eventually run out. Question Give one example of a non-renewable energy resource. Tap to flip Answer E.g. coal, oil, gas or nuclear fuel. Question Give one example of a renewable energy resource. Tap to flip Answer E.g. biofuel, wind, hydroelectricity, geothermal, tidal, solar or water waves. Question How were fossil fuels formed? Tap to flip Answer Over millions of years, from the remains of dead organisms. Question What does using energy sustainably mean? Tap to flip Answer Using energy resources so that there will be enough for people's needs in the future. Question Science can identify environmental issues; what kinds of consideration determine the action taken? Tap to flip Answer Political, social, ethical and economic considerations. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage GCSE (Years 10–11) Course GCSE Physics Unit Mains electricity Exam boards AQA, Edexcel, OCR Tiers foundation and higher England's National Curriculum sets what is taught; the units and their order are Oak National Academy's. Flash Feed is not affiliated with Oak or any exam board.
How this deck was checked On 2026-11-02, every card was compared with its source: the lessons of Oak National Academy, a public body funded by England's Department for Education that publishes lessons for the national curriculum. Because the cards come from those lessons, no second source was sought. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.
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A Physics lesson by Oak National Academy licensed under Open Government Licence (OGL)
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