注目の話題: 経済的な理由で大学に行けないことはおかしいですか？; 俺は正しい！まともだ！; あまりにも稚拙な旦那にウンザリです

science,math and English

No.105　12/01/08 18:53
名無し0 ( 50代 ♂ ) あ+あ-

【An electromagnet of handmade】Ⅱ

We cut the drinking straw to make a fit to length of the nail,and we pass the nail through the straw.😃

We only have to touch both ends of the copper wire with the dry cell,so we finally complete electromagnet.🎊

Parts which the copper wire contacts with the dry cell becomes hot,so we should wear the cotton work gloves then in order to press those parts.

【Electric power and quantity of the electric power】

『Electricity means that work which the electric power does at one second』

We make use of electricity which an electric power company sends us,and pay its bill,according to amount of the electric power which we use.💡

The electric power is work which the electricity does at one second.As for its unit,we adopt W,and express the electricity with the next formula.😃

The electricity means W,voltape is V,and electric current is A.

W ＝ V×A

Electric current of 1 A runs with 1 V at 1 second.We call the work 1 W.