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Resistors - year 7
Transcript of Resistors - year 7
This is a resistor!
It's job is to help control the flow of electricity in a circuit
Electricity in a circuit can be likened to water in pipes!
the pipe represents
This is the symbol we
use to show a resistor
We measure resistance in 'Ohms'
There are many values of resistor
for different applications
do I need?!
The resistor code
The resistor value
This is a long way of saying it!
Kilo = Thousand
Mega = Million
390000 = 390k
Other types of resistor
Light Dependant Resistor
Decode the resistors to find the value
Silver = 10%
Gold = 5%
Band 4 = tolerance
Brown - Black - Red
Gold = 5% tolerance
100 = 10
... 5% is half of 10%
That's how to work out 10% ...
10 2 = 5
The resistor is 995 - 1005 ohms
tolerance is the accuracy,
how well it has been made.
Design a product that uses
one or more of these resistors.
It can be anything you like but you must show how it's operation varies with the resistor value changes.