In some instances, the groom's family will pay for the rehearsal dinner costs. It is also common for the groom's family to pay for tuxedo rental for the groomsmen. But none of these are rules per se. Talk it over with each family to see what works best for you.
Electrical Units of Measure. The standard SI units used for the measurement of voltage, current and resistance are the Volt [ V ], Ampere [ A ] and Ohm [ Ï ] respectively.
Electric power is the rate at which an electrical circuit transfers  electric energy. The SI unit of power is the watt which is one  joule per second. Wattage, Watts, and (W) are what power is measured in there just different ways to say watts. Watts is the term used to define a quantity of power. If you were  looking for a device used to measure power, that is called a  wattmeter.