Presentation on theme: "Electricity Current Voltage Resistance Current, Voltage, Resistance characteristics AC DC Plugs Earth Fuses Power."— Presentation transcript:
Electricity Current Voltage Resistance Current, Voltage, Resistance characteristics AC DC Plugs Earth Fuses Power
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
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.
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)
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