An electric arc is a phenomenon where a strong current flows between electrodes.

The river water is flowing quietly.

It is important to accurately determine the position of the electrode.

Lightning is one of the electrical discharge phenomena in the atmosphere.

When lightning discharges electricity into the air, we observe it as a flash of lightning.

We need to measure the strength of this electric current.

This phenomenon remains unexplained for scientists.

An arc of electricity passed through the air.

Inside the cinema, the arc lamp was shining brightly.

This tree is very hard.