Resistance Calculator

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RESISTOR CALULATOR POWER CALCULATOR (ie: P=IxE)

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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 A.C. will have 144 ohms of resistance and will draw approximately   
    (according to the maths) 0.625 Amps.  
    
    Enter 150 in the " Watts " field and enter 240 in the " Volts " field and press the Calculate button to find the resistance   
    and calculated current. The resistance of the 150 watt bulb is in fact calculated as 384 Ohms.

    Note: All Fields shall be reset to ZER0 (0) before commencing each and every new calculation by  using the " Reset " button.

E=IR therefore: 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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