Free resource

An independently reorganised formula reference is being prepared for review.

Ohm's law and the three power forms. Series and parallel. Resistivity and volt drop. r.m.s., peak and average. Induced e.m.f. and the motor effect. Impedance and power factor. Grouped by what you are trying to work out, so you can find the right one under pressure.

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Independent revision resource. Not an official City & Guilds product, not a qualification, and not affiliated with or endorsed by any awarding organisation.