Electricity is measured in watts, named after James Watt who invented the steam engine. It would take about 750 watts to equal one horsepower.

A kilowatt-hour is the energy of 1,000 watts that work for one hour. If, for example, you use a 100-watt light bulb for 10 hours you have used 1 kilowatt of electricity.



An electricity meter measures how much energy you have used
Image: Zomettapuach, CC BY-SA 3.0,
via Wikimedia Commons



Words

  • equal = to be the same as
  • invent = create for the first time
  • light bulb = a glass object that is inside a lamp -  it produces light
  • measure = the unit of something
  • steam engine = an engine or motor that works with steam power