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Electrical power and I-V characteristicsEdexcel A-Level Physics: Mind map

What this mind map covers

  • Power and energy
  • Ohmic conductor
  • Filament lamp
  • NTC thermistor
  • Diode

Exam questions on Electrical power and I-V characteristics

  1. An electric kettle is rated 2.3 kW when connected to the 230 V mains supply. Its heating element is a single piece of resistance wire.
    The kettle is switched on for 3.0 minutes at its rated power. Calculate the energy transferred by the element. Give your answer in joules.2 marks
  2. A student investigates a filament lamp using a variable power supply. At a p.d. of 2.0 V the current in the lamp is 0.50 A, and at a p.d. of 12 V the current is 1.5 A.
    Explain why the resistance of the lamp at 12 V is greater than its resistance at 2.0 V.2 marks
  3. A silicon diode is connected in series with a 220 Ω resistor and a 6.0 V battery of negligible internal resistance. When the diode is forward-biased the p.d. across it is 0.70 V.
    Calculate the current in the circuit.3 marks
See the full worksheet

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).