Basic electronic components
An introduction to electronic components that you will need to build a motor speed controller.
Resistors
A resistor impedes the flow of electricity through a circuit.
Resistors have a set value. Since voltage, current and resistance are related through Ohm's
law, resistors are a good way to control voltage and current in your circuit.
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More on resistors
Resistor color codes 1st band = 1st number 2nd band = 2nd number 3rd band = # of zeros / multiplier 4th band = tolerance
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Color code
Tolerance: Gold = within 5%
Black: 0 Brown: 1 Red: 2 Orange: 3 Yellow: 4 Green: 5 Blue: 6 Violet: 7 Gray: 8 White: 9
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Units
Knowing your units is important!
Kilo and Mega are common in resistors Milli, micro, nano and pico can be used in other
components
K (kilo) = 1,000 M (mega) = 1,000,000 M (milli) = 1/1,000 u (micro) = 1/1,000,000 n (nano) = 1/1,000,000,000 (one trillionth) p (pico) = 1 / 1,000,000,000,000 (one quadrillionth)
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