Terms electricity
Voltage, current, resistance, power. 6 tools.
CurrentElectric current explained: what is actually moving, why conventional current runs opposite to the electrons, and what typical currents look like.Electric chargeWhat electric charge is, the size of the elementary charge, how coulombs relate to amp-hours, and why battery capacity is quoted in mAh.Electric powerElectrical power explained: the three forms of the power formula, real versus apparent power, and why your bill is in kilowatt-hours rather than kilowatts.Power factorPower factor explained without the hand-waving: what causes it, what a poor one costs you, typical values by load type, and how correction works.ResistanceHow resistance opposes current, what determines it in a conductor, how it changes with temperature, and how resistors combine in series and parallel.VoltageWhat voltage actually is, how it differs from current, the symbols and units used for it, and how to measure it safely with a multimeter.