Hello, In ohm's law, there are four categories. The voltage, current, wattage and the resistance. Voltage is measured in volts. Current is measured in amperes. Wattage is measured in watts. And resistance is measured in ohms. Am I correct? To get the ohms of one electrical device, I should divide voltage (volts by current (amps)? Am I correct? Means, if I have 12 volts, 5 watts lamp. I will get about 0.4166666666666667 amperes. 12 divided by 0.4166666666666667 equals 28.799999999999997. Right? Am I correct? Thank you.