Investigating How A Car Tester Works Using a Light Emitted Diode
This assignment is to find out how a car tester circuits works using a
LED (Light Emitted Diode). If these lights light up, the circuit
works. The circuit is tested with two LED light using green and other
as red. If one or the other lights up, this meant that the circuit
worked. The following pages will show how I had got the circuit to
work.
LED Circuit
===========
LED's are special diode that can discharge light when connected to the
correct a circuit.
There are two wires below the LED which show the way the LED should be
connected to the circuit. The negative side of the LED is the smaller
wire on the flat end of the LED. This means that this wire should be
connected to the negative side of the battery.
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This shows the LED of that needs to be powered for it to work.
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Diode Circuit
=============
Diode circuit is the same setup as the LED circuit. This works without
us knowing that the circuit is on. The LED is just for us to see
weather it is on due to we cannot see the circuit if it is running
successful or not. Also to test the circuit is on; we measure the
currents using a ammeter. If it produces a result, the circuit works.
[IMAGE]
This shows the Diode that needs to be powered for it to work.
[IMAGE][IMAGE][IMAGE]
Resistor
========
A resistor has many different bands that tell the value of the
resistor. See the diagram below.
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Each colour band represents different amounts. This can be identified
and matched by using the colour coded chart.
Colour Band Code Chart
0
=
Black
1
=
Brown
2
=
Red
3
=
Orange