Ohm's Law Calculator
Calculate voltage, current, resistance, and power instantly
Ohm's Law
V = I x R
Power Law
P = V x I
Fascinating Electricity Facts
Georg Ohm's Discovery
In 1827, Georg Ohm discovered the relationship between voltage, current, and resistance. His work was initially rejected by the scientific community, and he lived in poverty until his law was finally recognized.
Lightning Bolt Power
A single lightning bolt contains about 1 billion volts and 30,000 amperes of current. The average flash lasts only 0.0002 seconds but releases enough energy to power a 100-watt bulb for 3 months.
Human Body Resistance
The human body has a resistance of 1,000-100,000 ohms depending on conditions. Wet skin has much lower resistance, which is why electrical shocks are more dangerous when wet.
War of Currents
In the 1880s, Edison promoted DC power while Tesla and Westinghouse championed AC. Tesla's AC won because it could be transmitted over long distances more efficiently, powering our modern grid.
Global Power Grid
Different countries use different frequencies: 60Hz in Americas and 50Hz in Europe/Asia. This isn't random - it's based on early generator designs and historical engineering decisions.
Superconductor Magic
Superconductors have exactly zero electrical resistance when cooled below critical temperatures. Current can flow forever in a superconducting loop without any energy loss.
Electric Eel Voltage
Electric eels can generate up to 860 volts at 1 ampere - enough to stun a horse. They have three specialized organs that work like thousands of tiny batteries in series.
Static Electricity
Walking across carpet can generate up to 35,000 volts of static electricity. You don't get hurt because the current is extremely low - only a few microamperes.