Amps, Watts, Volts and Ohms
Voltage (V), current (I) and resistance (R) are the three most basic units in electricity. Voltage is measured in volts, current is measured in amps and resistance is measured in ohms.
Current:
According to the basic equation in electrical engineering, “the current is equal to the voltage divided by the resistance”.
I (current) = V (voltage)/ R (resistance)
Voltage:
I = V / R can be restated as V (voltage) = I (current) * R (resistance)
Resistance:
R (resistance) = V (voltage) / I (current)
Watt:
Electrical power is measured in watts. The electrical system power (P) is equal to the voltage multiplied by the current.
P (electrical system power) = V (voltage) * I (current)
V = voltage in volts
I = current in amps
R = resistance in ohms