Units electricity
Amp, volt, watt, ohm, farad, decibel. 7 tools.
AmpereThe ampere explained: how it is defined, what one amp actually represents, the full prefix scale from picoamps up, and typical currents you will meet.DecibelThe decibel explained: why it is logarithmic, the difference between the power and amplitude formulas, and what dBm and dBW actually reference.FaradThe farad explained, why it is such an enormous unit that real parts are measured in microfarads, and the full capacitance scale with typical uses.Kilowatt-hourWhat a kilowatt-hour actually is, why your bill uses it instead of joules, and how much of it each appliance in the house gets through.OhmThe ohm defined, the standard resistor value series, why E12 values look so arbitrary, and the resistance scale from milliohms to gigaohms.VoltThe volt defined, what one volt means in energy terms, the prefix scale from microvolts to megavolts, and the voltages used around the world.WattThe watt explained: one joule per second, how it relates to volts and amps, the kilowatt-hour on your bill, and horsepower conversion.