electricity summary
This is only brief and summarise some of the key points.
- Created by: Serena_123
- Created on: 07-04-17 09:51
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- Electricity
- insulators rubbed together
- they become electrically charged
- Electrons are transferred when objects become charged
- when charged objects are brought together
- if the charge is equal then they will repel, otherwise they will attract
- Electric Current
- flow of electric charge
- Measured in Amps(A)
- A battery is a collection of cells
- The size of a current depends on the voltage and resistance
- Potential difference
- measured in Volts(V)
- the difference of electrical potential between two points
- Resistance
- the degree to which a device opposes the passage of an electric current
- Measures in Ohms
- ohms law
- electric current is proportional to voltage and inversely proportional to resistance.
- ohms law
- Series Circuits
- Current is the smae
- p.d is shared
- Resistance is added
- Parallel Circuits
- Current is shared through parallel loops
- Voltage is the same
- Resistance is not added
- National Grid
- made of pylons, transformers and cables
- distributes electricity around the country
- insulators rubbed together
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