The Resistor -. Resistance: When electrical current (flow of electrons) is slowed down - force it...
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Transcript of The Resistor -. Resistance: When electrical current (flow of electrons) is slowed down - force it...
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