The unit of resistance is called Ohm in honor of a German scientice by the name of Georg Simon Ohm, who discovered that when a conductor has a resistance of 1 ohm than an emf of 1 volt will cause a current of 1 amp to flow through a conductor.

Ohms Law. I = E/R or R = E/I or E = IR.

DC. or

The letter for Current is I and is expressed in amperes.

The letter for voltage is E and is expressed in volts.

The letter for resistance is R and is expressed in ohms.

The letters for power or wattage are P and W and are expressed power and watts.

The formulas for ohms law are.

If you know R the resistance and E the voltage the formula for finding I current is I = E/R.

If you know E the voltage and I the current the formular for R resistance is R =E/I.

If you know I the current and R the resistance the formula for E voltage is E = IR.

If you know I the current and E the voltage the formula for P power or W watts is P =EI.

If you know W watts and I current the formula for E voltage is E = P/I.

If you know W Watts and E voltage the formula for I current is I = P/E.

Example<>If you have a 1200 watt or 1.2 KVA electrical device and the voltage is 120 volts, the amperage rating for this device is approximately 10 amps. I amperage = P or watts divided by E voltage. The K in KVA stands for 1,000.

AC. or

The formulas for AC current involve impedance, effective value and

Basic Ohms Law Calculator below.

Ohms Law Calculator

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