Questions: Mains electricity, the National Grid and static
Pick a question type. Each time you get new numbers. Free ones are marked free.
Direct and alternating current, and the mains supply
- Direct and alternating currentChoose, 1 mark, free
- Frequency and potential difference of UK mainsChoose, 1 mark, free
- Colours of the wires in a three-core cableChoose, 1 mark, free
- What the live, neutral and earth wires doChoose, 1 mark, free
- Peak p.d., period and frequency from an a.c. traceDetermine, 5 marks, free
- Frequency and periodCalculate, 2 marks, Plus
- Why the live wire is dangerous even with the switch offExplain, 3 marks, free
- The earth wire, the fuse and safetyChoose, 1 mark, free
Electrical power, P = VI and P = I²R
- Power from potential difference and currentCalculate, 3 marks, free
- Current drawn by a mains appliance rated in kWCalculate, 3 marks, free
- Power from current and resistanceCalculate, 2 marks, free
- P = I²R with the current in mACalculate, 3 marks, Plus
- Resistance from power and currentCalculate, 3 marks, free
- Current from power and resistanceCalculate, 3 marks, Plus, Higher tier
- Which device takes the largest current?Compare, 3 marks, free
- Choosing the right fuseCalculate, 3 marks, free
Energy transferred, kilowatt-hours and cost
- E = Pt with the time in minutes, answer in kJCalculate, 3 marks, Plus
- Time from energy and powerCalculate, 3 marks, Plus
- Power in kW from energy in MJ and time in hoursCalculate, 3 marks, Plus
- Energy from charge and potential differenceCalculate, 3 marks, Plus
- Charge from energy, then time from currentCalculate, 4 marks, Plus
- Energy in kilowatt-hoursCalculate, 3 marks, Plus
- Kilowatt-hours to megajoulesCalculate, 2 marks, Plus
- Cost of running an applianceCalculate, 4 marks, Plus
- Which appliance is cheaper to run, and by how muchCalculate, 3 marks, Plus
- Cost from electricity meter readingsCalculate, 3 marks, Plus
- Kilowatt-hours and energyChoose, 1 mark, Plus
- Which appliance transfers the most energy?Compare, 2 marks, Plus
- Charge from current and time, then energyCalculate, 4 marks, Plus
The National Grid and transformers
- The parts of the National Grid in orderChoose, 1 mark, Plus
- Why the National Grid uses high potential differencesChoose, 1 mark, Plus
- Step-up or step-down?Choose, 1 mark, Plus
- Power wasted in transmission cablesCalculate, 3 marks, Plus
- Current in the cables, power lost and percentage wastedCalculate, 6 marks, Plus, Higher tier
- How raising the p.d. cuts the power wastedCalculate, 4 marks, Plus
- Secondary current from the transformer equationCalculate, 3 marks, Plus, Physics only, Higher tier
- Secondary p.d. from the transformer equationCalculate, 3 marks, Plus, Physics only, Higher tier
- Mains current drawn by a charger, in mACalculate, 3 marks, Plus, Physics only, Higher tier
- Why the National Grid uses high potential differences (6 marks)Explain, 6 marks, Plus
Static electricity
- Charging by friction: which way the electrons moveChoose, 1 mark, Plus, Physics only
- The charge left on the clothChoose, 1 mark, Plus, Physics only
- Attraction and repulsion between chargesChoose, 1 mark, Plus, Physics only
- How rubbing charges an insulatorExplain, 3 marks, Plus, Physics only
- Sparks, shocks and earthingChoose, 1 mark, Plus, Physics only
- Number of electrons transferredCalculate, 3 marks, Plus, Physics only
- Why a charged object attracts an uncharged oneChoose, 1 mark, Plus, Physics only
Electric fields
- Field lines and the direction of the forceChoose, 1 mark, Plus, Physics only
- Where the field is strongestChoose, 1 mark, Plus, Physics only
- What an electric field isChoose, 1 mark, Plus, Physics only
- The field pattern around a charged sphereChoose, 1 mark, Plus, Physics only
- Explaining a spark with the idea of a fieldExplain, 3 marks, Plus, Physics only
- Explaining a force without contactExplain, 3 marks, Plus, Physics only
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