Topic Summaries
Measuring resistance
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
- The current through a component can be measured using an ammeter.
- This must be connected in series with the component.
- Ammeters have very low resistance so that they don’t change the current in the circuit.
- The potential difference across a component can be measured using a voltmeter.
- This must be connected in parallel with the component.
- Voltmeters have very high resistances so that very little current flows through them.
- The resistance of a component can be found by measuring the current through it and potential difference across it.
- A variable resistor can also be used to vary the current through the component.
- By taking potential difference readings for multiple currents, it can be determined how the resistance changes for non-ohmic conductors.
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