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What is this unit about?
Electricity is a vital part of our lives and without it, barely
15% of the things we do today would be possible. How
much electricity do you use per day? Electric charge is
one of the basic properties of matter so if you want to
understand the world around you, you need to know
about electricity.
Katherine Lambert…read more

Slide 3

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If you rub a balloon against your jumper,
why does it stick to a wall?
When you rub a balloon against your jumper, the
electrons from one object jump to the other causing a
positive charge in the one with less electrons and a
negative charge in the one with more. These two
opposite charges attract
each other and so the balloon
sticks to the wall.
Katherine Lambert…read more

Slide 4

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What is electric current?
A flow of charge (or electrons) around an electric circuit.
This is what causes a bulb to light up, or a motor to run.
Katherine Lambert…read more

Slide 5

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What happens in an electric circuit?
A circuit starts with a battery or cell. This is the source of
the voltage. Little packets of volts are carried around the
circuit by electrons (when the circuit is closed) and when
it reaches for example, a light bulb, the volts are
deposited there and the electrons carry on round the
wire until they reach the battery or cell again and pick
up more volts. How fast the electrons travel around the
circuit is called current and is measured in Amps.
Katherine Lambert…read more

Slide 6

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What is the difference between convection
current and electron flow?
Convection current ­ Flow due to temperature
difference.
Electron Flow ­ The movement of electrons around an
electric circuit. This is known as current a.k.a. Ampage.
Katherine Lambert…read more

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