Electricity is the movement of electrons associated with electrical charge.
Electricity is a secondary energy source which means that we get it from the conversion of other sources of energy, like coal, natural gas, oil, nuclear power and other natural sources, which are called primary sources.
The energy sources we use to make electricity can be renewable or non-renewable, but electricity itself is neither renewable or non-renewable.
The comb has become charged by friction, acquiring an excess of electrons.
The paper (A) normally has a random distribution of (+) and (-) charges.
When the charged comb is held close to the paper (B), there is a reorientation of charges because of the repulsion of the charges.
This leaves a net positive charge on the side close to the comb, and since unlike charges attract, the paper is attracted to the comb
Beware of Door Knobs That Bite More apt to happen in dry weather…why? In dry weather, air acts and an insulator and an electric charge can build up your body. When your hand gets close enough to the door, the charge is conducted (discharged) from your hand to the knob. Humid air does not allow a large charge to build. The electricity is discharged into the air because water (humidity) is a good conductor.
In a primary cell or disposable battery, the chemical reactions that power a battery cannot be reversed
Example: alkaline dry cells
In a secondary cell or rechargeable battery, the flow of electrons can be reversed when it is plugged into an electrical outlet. Electrons are “sent back” to the anode and a new potential is formed. The cathode gains electrons, while the anode gives up electrons thus increasing the potential.
Examples: lead acid, nickel cadmium, lithium, etc.