Answers

2014-11-13T20:41:56+08:00
Using electricity, a motion can be done by the facility.
For light switch, after switching on, it just allows the current to flow towards the lamp or light. It doesn't produce a motion. For electric stove, it will produce heat. For light bulb, it will produce light. For electric fan, the electricity is converted into motion when the fan blade starts to rotate.
Therefore the answer is Electric Fan (D)
0