GCSE AQA Physics 2 Circuits

Current, resistance potential difference
1. Current - flow of electric charge around the circuit, units: amps
  1. Ammeter - in series
2. Potential difference - driving force that pushes the current round, units: volts
  1. Voltmeter - in parallel
3. Resistance: anything which slows the flow down, units: ohms
  1. Increases with temp. - ions in conductor move more, can't flow easily
4. The greater the resistance, the smaller the current
5. Current = Charge (C) / Time (s)
  1. Charge is measured in coulombs
6. Potential difference = Work done (J) / Charge (C)
Circuit Symbols
1. Cell
2. Battery
3. Open switch
4. Closed switch
5. Lamp
6. Fuse
7. LED
8. Resistor
9. Variable Resistor
10. Ammeter
11. Voltmeter
12. Diode
13. LDR
14. Thermistor
Potential difference-current graphs
1. Resistor - current is directly proportional to PD
2. Filament lamp - as temp. increases, resistance increases
3. Diode - current will only flow in one direction, high resistance in opposite
4. V = IR
Circuit devices
1. LED - emits light when flowing in forward direction
2. LDR - LURD (Light Up, Resistance Down)
3. Thermistor - TURD (Temp. Up, Resistance Down)
Series Circuits
1. Remove 1 component - broken
2. PD is shared
3. Current is the same
4. Resistance adds up
5. Cell voltages add up
Parallel Circuits
1. Each component separately connected
  1. Removing - won't affect
2. PD is the same
3. Current is shared

Zusammenfassung der Ressource

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