Question

what is current?how are they caused?

Answer 1

Hey!!!

In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionised gas (plasma). ... Electric currents cause Joule heating, which creates light in incandescent light bulbs.

hope it helps

Answer 2

Current is a flow of electrical charge carriers, usually electrons or electron-deficient atoms.

Currents are caused by two different ways. One is the force of wind on the surface of the water and the second is from different water temperatures that causes movement (convection). There are different strengths of a current depending on the cause. Winds are the biggest factor, but tides, precipitation, evaporation rates, shape of the ocean floor, and inflow from rivers and adjacent seas are also important