The Resistor

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The ResistorResistance: When electrical current (flow of

electrons) is slowed down- force it into a inefficient conductor- transforms the electrical energy into another form

Resistor: A device that slows down the flow of electrons by a measurable amount

The ResistorWhat do we need them for: They are used to

control current or potential difference in a circuit. This allows us to set the correct amount of voltage to sensitive parts of a circuit

Eg. Some parts of the computer need a slower current so they don’t melt down

Fixed Resistor color codeColor Fill in that color Number Value for first 3 bands

Black 0

Brown 1

Red 2

Orange 3

Yellow 4

Green 5

Blue 6

Violet 7

Grey 8

White 9

Gold X 0.1

Silver X0.01

A Typical Fixed Resistor

This resistor = 13 x 10 2 Ω of resistance

Accuracy (%)

• Accuracy band: Tells us how accurate this resistor is

Color Accuracy it indicates

Gold Accurate within 5%

Silver Accurate within 10%

No color Accurate within 20%

You try: A Typical Fixed Resistor

This resistor =____________________

You try: A Typical Fixed Resistor

This resistor = 64

You try: A Typical Fixed Resistor

This resistor = 64 x 10 0 Ω of resistance

Find the resistance and accuracy

a)

b)

c)

d)

Determining the Range of the Fixed Resistor

Eg

= 27 X 104 within 5%

Determining the Range of the Fixed Resistor

Eg

= 27 X 104 within 5%

Determining the Range of the Fixed Resistor

Eg

= 27 X 104 within 5%

= 80 X 105 within 5%

Determining the Range of the Fixed Resistor

Calculate the range for the other 2 fixed resistors