We installed solar batteries on the roof of our house.

He sent me important information by telegram.

I want to go to Denmark.

The battery ran out, and the light stopped working.

The incandescent light bulb has burned out, so I'm going to buy a new one.

In this area, power generation by wind power is the mainstream.

We need to measure the strength of this electric current.

The study of superconductivity is an important field in physics.

This research institute is exploring new applications for superconductivity.

Thunder roared, and lightning ran.