# Electricity

## Electrical Charge, Electric Fields, Coulomb's Law And The Forces Between Electrical Charges, ResistanceCurrent, Voltage, Ohm's law

Electricity is a natural phenomenon resulting from one of the most basic properties of **matter**, electrical charge. Our understanding of electrical principles has developed from a long history of experimentation. Electrical technology, essential to modern society for **energy** transmission and information processing, is the result of our knowledge about electrical charge at rest and electrical charge in **motion**.

The basic unit of **electric current** is the ampere, named for the French physicist Andre Marie Ampere. One ampere equals 1 coulomb of charge drifting past a reference point each second.

Voltage is the ratio of energy stored by a given a quantity of charge. Work must be performed to crowd same-polarity electric charges against their mutual repulsion. This work is stored as electrical potential energy, proportional to voltage. Voltage may also be thought of as electrical **pressure**.

The unit of voltage is the volt, named for Alessandro Volta. One volt equals one joule for every coulomb of electrical charge accumulated.

**Ohm's law** defines the relationship between the three variables affecting simple circuit action. According to Ohm's law, current is directly proportional to the net voltage in a circuit and current is inversely proportional to resistance.

## Additional topics

- Electricity - Electrical Charge
- Electricity - Electric Fields
- Electricity - Coulomb's Law And The Forces Between Electrical Charges
- Electricity - Resistance
- Electricity - Electrical Power
- Electricity - Alternating Current And Direct Current
- Other Free Encyclopedias

Science EncyclopediaScience & Philosophy: *Dysprosium* to *Electrophoresis - Electrophoretic Theory*