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# Resistors - year 7

A basic introduction to resistors for KS3
by

## Chris Chapman

on 4 July 2017

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#### Transcript of Resistors - year 7

Resistors
This is a resistor!
It's job is to help control the flow of electricity in a circuit
Ohms
The symbol
of Ohms!
Electricity in a circuit can be likened to water in pipes!
flow of
water
the pipe represents
electrical wire
Resistance!
flow of
electricity
This is the symbol we
use to show a resistor
We measure resistance in 'Ohms'
There are many values of resistor
for different applications
Argh!
Which one
do I need?!
The resistor code
Band 1
Band 2
Multiplier
Tolerance
3
9
0000
The resistor value
390000
This is a long way of saying it!
Kilo = Thousand
Mega = Million
390000 = 390k
Other types of resistor
Variable resistor
Thermistor
Light Dependant Resistor
LDR
(potentiometer)
Decode the resistors to find the value
Cool Circuit!
Silver = 10%
Gold = 5%
Band 4 = tolerance
Tolerance
Brown - Black - Red
1000 ohms
Gold = 5% tolerance
1000
.
.
100 = 10
... 5% is half of 10%
Easy!
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.
Tolerance
Colour Bands
Protection
2600000
Products
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.
Your Task
Sorry mate,
no trainers!
3
9
0000
The resistor value
Full transcript