The Socket Is a Waterfall - volts, amps, watts and the bill

That board is about moving heat, which is cheap. This lesson is about where the expensive kind, made heat, comes from: current squeezing through a wire.

This lesson’s own board:

The strip, the wire and the fuse that gives way first, drawn for this lesson.

Before you start. You need one idea from Cold Is a Lie - fridge, AC, heat pump: a heater has to make every joule of heat it gives you, while a heat pump only moves heat that already exists. A joule is the unit energy is counted in, and a watt is one joule every second. Nothing about electricity is assumed; every word below is shown working before it gets a name. (Twice the Speed, Four Times the Stop - braking, crumple zones and seatbelts does the same job for the energy of a moving car, if you read it first.)