Calculate current, power, and energy consumption using Ohm's law from voltage and resistance values.
Ohm's Law states that current through a conductor is directly proportional to voltage and inversely proportional to resistance: I = V/R. It's the fundamental relationship in electrical circuits.
Watts measure instantaneous power. Kilowatt-hours (kWh) measure energy over time. A 100 W bulb running for 10 hours uses 1 kWh. Your electricity bill is charged per kWh.