A light bulb converts electrical energy into light energy when it is turned on.
Most of the energy a light bulb uses turns into heat.
Light bulbs change electricity into heat.
What is converted to heat in a light bulb?
  * Firecrackers
  * electricity
  * peachleaf willow
  * an object
  * layers of fat
  * an electron lens
  * sunlight
  * our nearest star