Topic Summaries
AC and DC currents
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
Pressure
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
Pressure
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
- A direct potential difference provides a direct current, which always flows in the same direction.
- An alternating potential difference causes an alternating current, which is constantly changing direction.
- The number of times the current changes direction per second is its frequency.
- Frequency is measured in Hertz, Hz, and 1 Hz is 1 cycle per second.
- In the UK, mains electricity is supplied as an AC current of ~230 V and 50 Hz.
Unlock AC and DC currents
Subscribe to SnapRevise+ to get immediate access to the rest of this resource.
Premium accounts get immediate access to this resource.