Download - ELECTRICAL CIRCUITS AND COMPONENT SYMBOLS
ELECTRICAL CIRCUITS AND ELECTRICAL CIRCUITS AND COMPONENT SYMBOLSCOMPONENT SYMBOLS
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Some circuit symbolsSome circuit symbolsIn circuit diagrams components are represented by the following symbols;
cell battery
switch
lamp
motorammeter
voltmeter
buzzer
resistor
Circuit
Breaker
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The CELLThe CELL
The cell stores chemical energy and transfers
it to electrical energy when a circuit is
connected. When two or more cells are
connected together we call
this a Battery.
The cells chemical energy is
used up pushing a current
around a circuit.3
What is an electric current?
An electric current is the flow of electrons
through a circuit.
+ -
In which direction does the current flow? from the Negative terminal to the Positive terminal of a cell.
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simple circuitssimple circuits
Here is a simple electric circuit. It has a cell, a
lamp and a switch.
To make the circuit, these parts are connected
together with metal wires.
cell
lightswitch
wires
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simple circuitssimple circuitsWhen the switch is closed, the circuit is complete, and the lamp lights up. This is because there is a continuous path 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 diagramcircuit diagram
cell switch
light wires
Electrical drawings are usually drawn using symbols;
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types of circuitstypes of circuits
There are two types of electrical circuits;
SERIES CIRCUITS PARALLEL CIRCUITS
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The components are connected end-to-end, one after the other.
Electrons flow in only ONE path.
SERIES CIRCUITS
If one bulb ‘blows’ it breaks the whole circuit and all the bulbs go out. 9
PARALLEL CIRCUITS
The current has a choice of routes (MANY paths).
The components are connected side by side.
If one bulb ‘blows’ there will still be a complete circuit to the other bulb so it stays lit.
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All information researched on the following web sites.
http://www.google.ca/search?q=electric%20circuit&rls=com.microsoft:en-ca&oe=UTF-8&startIndex=&startPage=1&gws_rd=cr&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi
http://www.technologystudent.com/elec1/elecex.htmwww. Teachingzone.org (Electricity awareness course pack for teachers produced by C2B Media LTD