It is an elementary question. Which atom is not electrically neutral ?
When one or more electrons is stripped away from an atom, it becomes positively charged. Some atoms can attract additional electrons so they become negatively charged. Atoms which are not electrically neutral are called ions. Ions with a positive charge are called cations. Ions with a negative charge are called anions.
Electricity?
Sometimes, the electrons in an atom's outermost shells do not have a strong force of attraction to the protons. These electrons can be pushed out of their orbits. Applying a force can make them shift from one atom to another. These shifting electrons are electricity.
The rest mass of an electron is 9.1093837015 × 10^(−31) kg, which is only 1/1,836 mass of a proton. An electron is therefore considered nearly massless in comparison with a proton or a neutron.
AC(alternative current) is an electric current when electrons flow in two directions, from positive to negative terminal and from negative to positive terminal, 'alternating' between two directions.
DC (direct current) is an electric current getting from batteries and solar cells. Here, electrons travel in only one direction.
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