Electricity

IntroductionToday, electricity is the one of important energy. Bulbs, televisions, motors and computers use electricity. Electricity has two important forms: static electricity and electric current.Usually, electricity is supplied as electric current through cables, wires for our life.

What is the static electricity?Investigation 1Try an investigation below and

Let’s review Investigation

1

rub two straws with a piece of tissue

Bring 　 a straw close to a plastic bag

Bring 　 a straw close to paper which you rubbed

Paper

Pierce a straw with needlebefore rubbing them

Paper

Straw1Rubbing

Paper

Straw2Rubbing

Another straw for a bearing

Attract or keep away (repel)

After identifying result, review this investigation

Result1

Result2

Keep away(repel)

Attract