1. The units for power are watts.

  2. Joules are the units for electricity.
  3. A 700W microwave uses more power then a 450W microwave.
  4. ?
  5. There are 1000W in a KW
  6. The units for voltage are and the units for currents are I

I think people get double or triple glazing To keep there house warmer and to safe money on your gas bill or your electric.