"The other unit I would suggest adding to the list is that of power. The power conveyed by a current of an Ampère through the difference of potential of a Volt is the unit consistent with the practical system. It might be appropriately called a Watt, in honour of‥James Watt.‥ A Watt, then, expresses the rate of an Ampère multiplied by a Volt, whilst a horse~power is 746 Watts, and a Cheval de Vapeur 735" (OED).