Where the system voltage is high enough, an electric arc may form between power system conductors and ground.

If the power supply and load allow sufficient current to flow, a self-sustaining arc may form.

After a few more lines, an unmistakable arc had formed, composed of ones.

Even as he watched, the two second suns stretched out into arcs, and a third luminous arc formed above the sun.

Where the voltage is sufficiently high, an arc can also form as the switch is closed and the contacts approach.

Start of the current flow can be delayed past the point at which the arc would form in an uncontrolled valve.

Heavy and long persistent arcs formed almost in regular time intervals.

As the lineman approaches the wire, an arc will form between them as the worker is charged.

If the voltage across the dry band is high enough, an arc may form which can damage the jacket.

The rising arc of the building forms a sheltered communal space between the building and the wooded hill to the west.