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Physics

  • IGCSE Edexcel
  • Revision Notes

2. Electricity

2.1 Mains Electricity>2.2 Energy and Voltage in Circuits>2.3 Energy Charge>

1.1 Movement and Position >1.2 Forces, Movement, Shape and Momentum >

3.1 Properties of Waves >3.2 The Electromagnetic Spectrum >3.3 Light and Sound >

4.1 Energy Transfers >4.2 Work and Power >4.3 Energy Resources and Electricity Generation >

5.1 Density and Pressure >5.2 Change of State >5.3 Ideal Gas Molecules >

6.1 Magnetism >6.2 Electromagnetism >6.3 Electromagnetic Induction >

7.1 Radioactivity >7.2 Fission and Fusion >

8.1 Motion in the Universe >8.2 Stellar Evolution >8.3 Cosmology >

2.1 Mains Electricity

2.1.1 Use the following units: ampere (A), coulomb (C), joule (J), ohm (Ω), second (s), volt (V) and watt (W)

Measurement Unit
Current Amperes (A)
Charge Coulombs (C)
Energy Joules (J)
Resistance Ohms (Ω)
Time Seconds (s)
Voltage Volts (V)
Power Watts (W)

2.1.2 Understand how the use of insulation, double insulation, earthing, fuses and circuit breakers protects the device or user in a range of domestic appliances

2.1.3 Understand why a current in a resistor results in the electrical transfer of energy and an increase in temperature, and how this can be used in a variety of domestic contexts

  • Electrons collide with metal atoms of resistor
  • Transfers electrical energy to thermal energy
  • Can be used in heating appliances, such as:
    • Electric heaters
    • Electric ovens
    • Electric irons
    • Stove
    • Water heater

2.1.4 Know and use the relationship between power, current and voltage:

Power = Current × Voltage

and apply the relationship to the selection of appropriate fuses.

2.1.5 Use the relationship between energy transferred, current, voltage and time:

Energy Transferred = Current × Voltage × Time

2.1.6 Know the difference between mains electricity being alternating current (a.c.) and direct current (d.c.) being supplied by a cell or battery

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