# Electricity

Electricity is the form of energy (the ability to do work) that results from charged particles (electrons, protons). Power ($P$) from electricity is generated when potential electrical energy, referred to as voltage, is released so that it "flows" through a conductor as a current where it encounters resistance. This flow is mathematically described by Ohm's Law, and the amount of power generated is described by the Watt's Law.

## Relationships between Voltage, Current, Resistance, and Watts

Ohm's Law and Watt's Law describe the relationship between volts, amps, ohms and watts as $I = V/R$ and $P=IV$, respectively. These equations allow for substitutions: for example $I$ can be substituted with $V/R$ so that $P=(V/R)V$ or $P=V^2/R$.

## SI Units Used in Electricity

NameSymbolMeasuresDefinition
Ampere$A$Current${C}/{s}$
Coulomb$C$Charge$A \cdot S$
Farad$F$Capacitance$C/V$
Henry$H$Inductance$Wb/A$
Hertz$Hz$Frequency$s^{-1}$
Ohm$\Omega$Resistance$V/A$
Siemens$S$Conductance$A/V$
Tesla$T$Magnetic field strength$Wb/m^2$
Volt$V$Voltage$W/A$
Watt$W$Power$J/s$
Weber$Wb$Magnetic flux$V \cdot s$

## Deeper Knowledge on Electricity

### Conductance and Siemens

The ability to conduct to current, measured in siemens

### Charge and Coulombs

How force is exerted in electromagnetic field, measured in coulombs

### Resistance and Ohms

Opposition to current, measured in ohms

### Current and Amperes

The flow of electricity, measured in amps

### Voltage and Volts

Electrical potential energy, measured in volts

### Electrical Engineering

Build and deconstruct electrically powered devices

### Watt's Law (Power Law)

A formula to define the relationship between power, voltage, and current (P=IV)

### Ohm's Law

A formula for determining voltage, current, and resistance

## Broader Topics Related to Electricity

### Physics

The fundamental nature and properties of matter, energy, and motion

### Power (Physics)

Energy that results from charged particles