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Slide 1

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Mains Electricity Revision
By Hattie Porter 11G…read more

Slide 2

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· 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

Slide 3

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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

Slide 4

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Calculating peak voltage and frequency
using oscilloscope diagrams
Red Peak Voltage ­ +300V measure from 0 line
Peak Frequency ­ f = I/T f =1/4 f = 0.25
0 1 2 3 4 5 6 7 8
Time…read more

Slide 5

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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.
c.…read more

Slide 6

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Colour and functions of wires in a 3
in plug
Earth wire ­ yellow/green.
This can avoid
electrocution, in case of a
faulty live wire, it will
conduct the charge down
to the ground.
Live wire ­
brown. This
supplies energy
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
it.…read more


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