Resistors
A resistor is a device that opposes the flow of electrical current. The bigger the value of a resistor the more it opposes the current flow. The value of a resistor is given in ohms and is often referred to as its ‘resistance’.
Identifying Resistor Values
| Band Colour | 1st Band | 2nd Band | Multiplier x | Tolerance |
| Silver | ÷ 100 | 10% | ||
| Gold | ÷ 10 | 5% | ||
| Black | 0 | 0 | 1 | |
| Brown | 1 | 1 | 10 | 1% |
| Red | 2 | 2 | 100 | 2% |
| Orange | 3 | 3 | 1000 | |
| Yellow | 4 | 4 | 10,000 | |
| Green | 5 | 5 | 100,000 | |
| Blue | 6 | 6 | 1,000,000 | |
| Violet | 7 | 7 | ||
| Grey | 8 | 8 | ||
| White | 9 | 9 |
| Example: Band 1 = Red, Band 2 = Violet, Band 3 = Orange, Band 4 = Gold | Too many zeros? | ||
| The value of this resistor would be: | kilo ohms and mega | ||
| 2 (Red) 7 (Violet) x1,000 (Orange) | = 27 x 1,000 | ohms can be used: | |
| = 27,000 with a 5% tolerance (gold) | 1,000 ohms =1k | ||
| = 27k ohms | 1,000k = 1M |
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