Slides in this set
· Current (I) The rate of flow of charge (how fats
electrons are moving). No current can flow if the
circuit is broken, for example, when a switch is
open. Measured in amps/A.
· Voltage (V) amount of electrical energy per
charge (push of electrons). Measured in volts/V.
· Resistance (R) ability to slow down current.
Measured in ohms/ .…read more
Definition and Graphs
· DC - Batteries produce direct current, or DC, electricity. The current flows in the same
direction all of the time, as shown by this typical voltage-time graph.
· AC - Generators produce alternating current, or AC, electricity. The current reverses
direction regularly, as shown by this typical voltage-time graph…read more
Mains Electricity in UK
The UK mains electricity supply is about
230V and 50Hz. Electrical circuits, cables,
plugs and appliances are designed to
reduce the chances of receiving an electric
shock. Electrical supplies can be d.c. or a.
Colour and functions of wires in a 3
Earth wire yellow/green.
This can avoid
electrocution, in case of a
faulty live wire, it will
conduct the charge down
to the ground.
to the house.
Neutral wire blue.
This is where it leaves the
Fuse this helps to
avoid electrical fires,
by breaking the
circuit if too much
current flows through