Before clicking for the answer, enter numbers into the equation you wish to use to calculate for Current, Power, Resistance, or Voltage.

Current (I)

Power (P)

Resistance (R)

Voltage (E)

Current (I)

I = P / E
Power Watts	Voltage Volts		Current Amps

I = Square Root of (P / R)
Power Watts	Resistance Ohms		Current Amps

I = E / R
Voltage Volts	Resistance Ohms		Current Amps

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Power (P)

P = I 2 x R
Current Amps	Resistance Ohms		Power Watts

P = E x I
Voltage Current Amps		Power Watts

P = E 2 / R
Voltage Volts	Resistance Ohms		Power Watts

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Resistance (R)

R = P / I 2
Power Watts	Current Amps		Resistance Ohms

R = E / I
Voltage Volts	Current Amps		Resistance Ohms

R = E 2 / P
Voltage Volts	Power Watts		Resistance Ohms

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Voltage (E)

E = I x R
Current Amps	Resistance Ohms		Voltage Volts

E = P / I
Power Watts	Current Amps		Voltage Volts

E = Square Root of (P x R)
Power Watts	Resistance Ohms		Voltage Volts

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Ohm's Law

Pie Chart | Calculators