Current Electricity

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Current Electricity
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What is Electric Current?

• Electric current is the flow of electricity
  through a conductor.
• Current is described as the movement of
  electrons.
• An electric current can provide energy to do work
• Example Turn on a light, move a motor.

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ELECTRICAL CIRCUITS
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CELLS
How can we get a current of electricity? A cell
stores chemical energy and changes it to
electrical energy when a circuit is connected.
When two or more cells are connected together it
is called a Battery.
The cell's chemical energy is used up pushing
electric current.
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What is an electric circuit?
Electrons flow in a complete path from one end of
a cell, through conducting wires, to the other
end of a cell.
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In which direction does the current flow?
Current flows from the Negative end of the cell
(terminal) to the Positive terminal of a cell.
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Simple Circuits
Here is a simple electric circuit. It has a cell,
a lamp and a switch.
wires
cell
switch
lamp
To make the circuit, these components are
connected together with metal connecting wires.
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When the switch is closed, the lamp lights up.
This is because there is a continuous path of
metal for the electric current to flow around.
If there were any breaks in the circuit, the
current could not flow.
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Circuit Diagrams
Scientists usually draw electric circuits using
symbols
cell
switch
lamp
wires
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More Circuit Symbols
There are many types of symbols you can use for
drawing circuit diagrams
cell
battery
switch
lamp
motor
ammeter
voltmeter
resistor