1. Electricity Current Voltage Resistance Current, Voltage, Resistance characteristics AC DC Plugs Earth Fuses Power

2. Current Current is the amount of charge flowing past a point in a given time Current (A) = Charge (C) / time (s) Current read by an ammeter – connected in series

3. Potential Difference Voltage Potential difference is the energy given to or given by a charge when it passes a component. PD (V) = Energy (J) / Charge (C) PD is taken by a voltmeter and is connected in parallel with the component.

4. Resistance Resistance is the volts per amp for a component. How many volts are needed to push a current of so many through a component. Resistance (Ohms) = PD (V)/ Current (A)

5. Circuit models Circuit diagrams Resistor models

6. IV Characteristics Resistor Bulb Diode

7. Resistors Thermistor LDR

8. review

9. Mains Elec PHET AC DC Period and frequency

10. Plugs

11. Fuse A Fuse is a piece of wire with a low melting point If there is a fault in the electrical appliance and the current goes up it could damage the wiring in the appliance But if a fuse is installed, this will melt (or “blow”) and break the circuit So a fuse is used to protect the appliance – not necessarily to protect us from electric shock

12. Earth What on Earth does it do? V d G

13. Earth No Earth – No Fault

14. Earth No Earth - Fault

15. Earth Earth – no Fault

16. Earth Earth - Fault

17. Power Power = work done / time taken Lifting stuff

18. Electrical Power Electrical power is the electrical work done in a given time. Power (W) = current (A) x voltage (V)