The chemist electrolyzed water to produce hydrogen and oxygen.

Mr. Tono is my best friend.

Denma is a city in America, known as Denver in Japan.

Every year, a large-scale ekiden is held in this area.

Nitrogen makes up about 78% of the Earth's atmosphere.

The light in the room suddenly went out, and it became pitch dark.

This old television still works.

Electromagnetic waves are a broad form of energy that includes light and radio waves.

This electrical machinery is very high performance.

The intensity of the electric field is proportional to the amount of charge.