Test: Electricity & Circuits

Combination of two or more cell in series is called battery.

Diamond is an extremely bad conductor of electricity. In diamond, each carbon atom is covalently bonded with four other carbon atoms. So, the four outermost electrons of a carbon atom are engaged or trapped in the covalent bonds, having no free electrons making it a bad conductor of electricity.

Filament of electric bulb is made up of tungsten due to high resistivity and high melting point.

Only metal spoon will allow the current to pass through because all others are insulators.

These are the materials which offers very high resistance to the flow(or in path) of electric Current.
In other words these materials have very high resistivity.

A thin coil of metal, which glows when electricity is passes though it is called filament.

Iron nail being a metal is a conductor of electricity while the rest are insulators.

Closed and continuous path of electric current is called circuit.

Electricity is used in watching television, running pump and driving car but riding bicycle do not use electricity.

A  Power house provide us with electricity.