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"NaN" on display means "Not a Number".

For Electrical Calculations

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Enter any two values then
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  Power   = Watts.

P=I * E
P=R*I 2
P=E 2 /R

  Voltage   = Volts.

E=(P*R) 0.5
E=P/I
E=R*I

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   Current   = Amps.

I=(P/R) 0.5
I=P/E
I=E/R


Resistance = Ohms.

Ω

R=E/I
R=P/I 2
R=E 2 /P