Physics - Electricity

Physics - Electricity

1. Charge

   • When a charge is placed near a charged object, it will experiance a force.
   • 1C=1As-1

2. Conductors

   • Metals, carbon

3. Insulators

   • Glass, plastic, wood

4. current is the flow of electrons

   • 1A= 1Cs-1

5. Voltage is the amount of electrical energy given to electrons by the battery

   • 1V=1JC-1

6. Resistance is material opposes current

   • V=IR
   • The higher the resistance the smaller the current

7. Series circuit

   • The current is the same at different positions
   • Vs=V1+V2+V3
   • Rt=R1+R2+R3

8. Parallel circuit

   • I=I1+I2+I3
   • The voltage across the resistors is the same
   • 1/Rt=1/R1+1/R2+1/R3

9. Changes energy into electrical energy

   • Microphone
   • Thermocouple
   • Solar cell
   • Thermistor
   • LDR

10. Changes electrical energy into different energy

    • Loudspeaker
    • Motor
    • Lamp
    • LED

11. A capacitor is a device which can store charge

12. Transistors

    • MOSFET
      • Turns on at 2V
    • NPN
      • Turns on at 0.7 V

13. Power is the change of energy over time

    • Mains supply is 230V
    • P=E/T
      • 1W=1J/S

14. AC is current that travels in both directions

    • 50HZ in Britain
      • Current changes direction 50 times per second

15. Direct current is when current flows in one direction

16. R1/R2=V1/V2

17. conduction is heat transfer in solids

18. convection- liquids and gases

19. Work done is when energy changes into another form of energy

    • Ew=Fxd

20. Pessure is the force an object exerts over an area

    • P=F/a

21. P1/T1=P2/T2

22. P1V1=P2V2

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