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Circuits
- The flow of electrons round a circuit is called the current.
- Voltage is the force that pushes the current round the circuit.
- If you increase the voltage, more current will flow.
- If you increase the resistance, less current will flow.
Ways of decreasing the current in a standard test circuit:
- Reducing the voltage from the battery.
- Increasing the resistance of the variable resistor.
The unit of...
Current - amp
Voltage - volt
Resistance - ohm
- Current flows from positive to negative.
- An ammeter should be connected in series with a component.
- Items that are in series can be in any order.
- A voltmeter should be connected in parallel with a component.
- Light dependent resistor – resistance decreases when light intensity increases.
- Thermistor – resistance decreases when temperature increases.
- Diode – only lets current flow in one direction.
This equation is very useful in I/GCSE Physics exam, draw the triangle out to make sure you get the calculation right! 👩🏻🏫
Series Circuits
- Components that are connected one after another on the same loop of the circuit are connected in series. The current that flows across each component connected in series is the same.
Parallel Circuits
- Components that are connected on separate loops are connected in parallel. The current is shared between each component connected in parallel.
Reference:
https://getrevising.co.uk/resources/current_electricity
This is the end of the topic!
Drafted by Cherry (Chemistry)