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Visually calculate any 3 colour " E24 series " Resistor value from Color Codes below with Tolerances


              




A Simple Interactive Ohms Law Calculator
Simply enter any of two known parameters or values and press "Calculate" to solve for the others.
A Simple example : A 150 watt light bulb operating on 240 volts AC will have 144 ohms of resistance and will draw 0.625 Amps.
Enter 150 in the " Watts " field and 240 in the " Volts " field and press the Calculate button to find the resistance and current. The resistance of the 150 watt bulb is in fact 384 ohms.
Note: All Fields should be reset to ZER0 (0) before each and every new calculation by using the " Reset " button.

Voltage ( E ) = Current ( I ) * Resistance ( R )
Power ( watts ) = Current Squared ( I^2 ) * Resistance ( R )
Power = I*E = E^2 / R

Volts (E)
Amps (I)
Ohms (R)
Power (Watts)

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