AQA GCSE Physics (8463) · AQA 8463
4.2 Electricity
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Practice questions on Electricity
- A student rubs a perspex rod with a silk cloth. Explain why the perspex rod becomes positi… (4 marks, Explain)
- Explain why a balloon that has been rubbed against a woollen jumper sticks to a wall. (4 marks, Explain)
- Explain why a spark is produced when a person who has built up a static charge reaches tow… (4 marks, Explain)
- Explain why step-up transformers are used in the National Grid before electrical power is … (4 marks, Explain)
- A string of decorative lights is wired in series. A homeowner replaces the string with a n… (4 marks, Describe)
- A student has a series circuit containing a battery and two bulbs. The student reconnects … (4 marks, Describe)
- Explain why a light dependent resistor (LDR) is useful in an automatic street-lighting cir… (4 marks, Explain)
- Explain why the resistance of a filament lamp increases as the current through it increase… (4 marks, Explain)
- Describe how the resistance of a thermistor changes as its temperature decreases, and expl… (4 marks, Describe)
- A student connects two resistors in series in a circuit and then reconnects them in parall… (4 marks, Explain)
- Explain why an ohmic conductor has a constant resistance, and describe how the current thr… (4 marks, Explain)
- Explain why adding a second resistor in parallel to a circuit reduces the total resistance… (4 marks, Explain)
- A student connects three identical lamps in a series circuit. The student then reconnects … (4 marks, Describe)
- Explain why the insulation around the three wires in a mains plug is colour coded. (4 marks, Explain)
- A household has two lamps connected in a parallel circuit. Describe how the potential diff… (4 marks, Describe)
- Explain why the earth wire is an important safety feature in a mains appliance that has a … (4 marks, Explain)
- Describe the role of the live wire and the neutral wire in a mains electricity supply, and… (4 marks, Describe)
- Explain why the live wire in a mains plug can be dangerous even when the appliance is swit… (4 marks, Explain)
- A student plugs a metal-cased electric kettle into a mains socket. Explain why a fuse is u… (4 marks, Explain)
- Explain why a kettle transfers electrical energy to thermal energy more usefully than a fi… (4 marks, Explain)