Topic Summaries
Electric motors (HT ONLY)
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
- An electric motor utilises the motor effect to convert electrical energy to kinetic energy through rotation:
- A rectangular coil of wire is placed in a magnetic field so that it can freely rotate around a pivot.
- When a current flows through the coil, the two sides of the coil experience vertical forces in opposite directions. This causes the coil to rotate.
- The coil receives current from a circuit connected to it with a split-ring commutator.
- This rotates while always maintaining a connection through the use of two carbon brushes. The split ring switches brush periodically so the current reverses and the forces on the coil are always in the same direction
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