Test: Electric Current & its Effects

Electric current originates because of the flow/drift of electrons and its direction is opposite to the direction of flow of electrons.

The substance that passes electricity is called conductor. Silver is a good conductor of electricity.

Hans Christian Orsted was a Danish physicist and chemist who discovered that electric currents creates magnetic fields, which was the first connection found between electricity and magnetism.

A circuit breaker can be used over and over again. The basic circuit breaker consists of a simple switch, connected to an electromagnet.

Generally electrical current requires a close path or circuit to flow, so when switch is off it won't flow. A switch prevents or allow the current to flow through it.

Electromagnet loses its magnetic property when current is switched OFF.

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An electromagnet loses its magnetic power every time an electric current is removed and becomes magnetic once again when the electric field is introduced.

When two cells are joined together via connecting wires in such a way that the positive end of one cell is joined the negative end of another cell. This arrangement is called a battery. Thus, a battery is a combination of two or more cells.

Electrons are negatively charged particles.

Electromagnet is a magnet that works as magnet in presence of current only. It is based on magnetic effect of electric current.

Filament of electric bulb is made up of tungsten, an alloy of metals having very high melting point.

An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region. In electric circuits this charge is often carried by electrons moving through a wire.