Resistors
Resistors are colour coded to tell you the amounts of ohms each resistor can handle in the circuit for example red,red, black, yellow is 22ohms. The black line is the multiplier of the first 2 bands eg. red,red x black =22 or 22 x 1 = 22 ohms. The yellow band is the torelance which the resistor goes up to which means it should be within 5% of that coding. To check this you can use a multimeter to check if its the right size and within its tolerance.
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