START A BITParts · Wiring and building
Resistors
220 Ω, 330 Ω, 1 kΩ, 2 kΩ, 10 kΩ
Holds the current back, so an LED or a pin is not damaged. The colour rings tell how much.
2Use it
| Pin or leg | What it is for |
|---|---|
| Two legs | the same: it can go in either way round |
- It has no + or -: put it in either way round.
- One in a row with every LED: 220 Ω.
- Two of them make a divider: 1 kΩ and 2 kΩ turn 5 V into about 3.3 V.
- Read the value from the colour rings, or measure it.
The idea behind it, step by step: Resistor
Used in
3Facts
| Use | 220 Ω for an LED; 1 kΩ and 2 kΩ to make 5 V into about 3.3 V |
|---|
Kinds you may find
| 4 or 5 colour rings | the rings give the value; a last gold or brown ring tells how exact it is |
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