Topic Summaries
Three-core cables
Energy and power
Renewable energy and efficiency
Charge, current, and electric fields
Potential difference and resistors
Electricity
Volume and gases
States of matter and heat capacity
Radiation
Nuclear fusion and fission
Forces
Velocity and acceleration
Gravity and Newton's Laws
Moments and elastic potential
Stopping, braking, and momentum
Properties of waves
Electromagnetic waves
Refraction and lenses
Light, colour, and ray diagrams
Absorbing and emitting infrared radiation
Magnetic fields
Motor effect, generator effect, and transformers
Science skills: Experimental procedures
Science skills: Presenting and using data
Science skills: Measuring results
Energy and power
Renewable energy and efficiency
Charge, current, and electric fields
Potential difference and resistors
Electricity
Volume and gases
States of matter and heat capacity
Radiation
Nuclear fusion and fission
Forces
Velocity and acceleration
Gravity and Newton's Laws
Moments and elastic potential
Stopping, braking, and momentum
Properties of waves
Electromagnetic waves
Refraction and lenses
Light, colour, and ray diagrams
Absorbing and emitting infrared radiation
Magnetic fields
Motor effect, generator effect, and transformers
Science skills: Experimental procedures
Science skills: Presenting and using data
Science skills: Measuring results
- Most electrical appliances connect to a wall socket using cables containing three wires:
- A live wire, which carries an alternating potential difference of 230 V from the mains supply.
- A neutral wire, which completes the circuit and has a potential difference of close to 0 V.
- The earth wire, which has a potential difference of 0 V. It is a safety wire which only carries current in case of a fault.
- There is a large potential difference between us and the live wire, so touching it would cause a current to flow through us and give us an electric shock.
- If the live wire touches a metallic appliance, then the earth wire is used to carry the resulting current away.
Unlock Three-core cables
Subscribe to SnapRevise+ to get immediate access to the rest of this resource.
Premium accounts get immediate access to this resource.