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N. 220 and 10K Ohm Resistors
Resistors limit the flow of electricity through part of the circuit. This can be used to control
timing circuits, divide voltages in to smaller portions or protect devices that are sensitive
to too much current.
Resistance is measured in Ohms (Ω), kilohms (1,000Ω=1kΩ) or Megohms (1,000,000Ω
=1MΩ) Resistors can go in the circuit either way round.
The value is marked on the device with a color code (see right), or it can be measured
with almost any multimeter.
A shorthand is often used to write the value of a resistor. For example: "100R"=100Ω
"10k"=10kΩ "4k7"=4.7kΩ
Some resistors used in these experiments: 220R – Red, Red, Brown 1k – Brown, Black, Red
10k – Brown, Black, Orange 100k – Brown, Black, Yellow.
Specification:
Resistor color codes:
1st band = 1st number
2nd band = 2nd number
3rd band = 3rd number
4th band = #of zeros/multiplier
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