The Resistor -. Resistance: When electrical current (flow of electrons) is slowed down - force it into a inefficient conductor - transforms the electrical.

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Presentation transcript:

The Resistor -

Resistance: 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 Resistor What 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 code ColorFill in that colorNumber Value for first 3 bands Black0 Brown1 Red2 Orange3 Yellow4 Green5 Blue6 Violet7 Grey8 White9 GoldX 0.1 SilverX0.01

A Typical Fixed Resistor This resistor = 13 x 10 2 Ω of resistance

Accuracy (%) Accuracy band: Tells us how accurate this resistor is ColorAccuracy it indicates GoldAccurate within 5% SilverAccurate within 10% No colorAccurate 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 10 4 within 5%

Determining the Range of the Fixed Resistor Eg = 27 X 10 4 within 5%

Determining the Range of the Fixed Resistor Eg = 27 X 10 4 within 5% = 80 X 10 5 within 5%

Determining the Range of the Fixed Resistor Calculate the range for the other 2 fixed resistors