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CIE Electricity and Magnetism
This topic includes both circuits which use direct current and mains electricity which is an alternating supply.
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- Permanent Magnets [FREE] - There is always a magnetic field around these materials
- Static Electricity - How static electricity is generated and introducing electric fields
- Circuit Symbols [FREE] - The symbols you need to remember when drawing and making circuits
- Electric Current [FREE] - The rate of flow of electrons
- Potential Difference and Resistance [FREE] - Potential difference is also known as voltage
- Resistors, Filament Lamps and Diodes [FREE] - Including their characteristics
- Resistors in Parallel [FREE] - How to calculate the total resistance of parallel combinations
- LDRs and Thermistors - Really useful components that can change their resistance
- Series and Parallel Circuits - How the potential difference and current vary
- Circuit Examples - Showing how to apply your new knowledge to circuits
- Building Circuits - Some ideas to help you make sure your electrical circuits always work
- Alternating Current - This the kind of electrical supply used in homes and industry
- Circuit Breakers - These are important safety devices
- Electrical Power - The rate of energy transfer and how we calculate this for circuits
- Energy Transfer in Circuits - The relationship between energy and potential difference
- Electromagnets - Here a current in a wire causes a magnetic field around it
- The National Grid - How electricity is transferred to our homes
- Transformers - Using a.c. these can change the potential difference and current
- The Motor Effect - When there is a current in a wire inside a magnetic field it causes movement
- Generators - When you move a conductor in a magnetic field we induce a potential difference