<span>Resistance of automobile light is equal to 12 ohms. </span>Resistance = Voltage / Current where Voltage = 12 volts Current = 1.0 Amperes Resistance = 12 volts/ 1.0 amperes Resistance = 12 ohms. Automobile light has 12 ohms resistance when it is connected to 12volts battery with 1.0 ampere current.