Electromotive force, also known as EMF, is the potential difference between two points in an electric circuit. It is the force that pushes electrons to flow from one point to another.
EMF is often used interchangeably with voltage, but they are not exactly the same. Voltage is the amount of potential energy per unit of charge, while EMF is the energy provided by a source per unit of charge.
The unit of measurement for EMF is volts (V) in the International System of Units (SI).
Some common sources of EMF include batteries, generators, solar cells, and power plants. These sources convert other forms of energy into electrical energy, which creates the potential difference necessary for EMF.
Yes, EMF can be negative. A negative EMF indicates that the direction of the electric current is opposite to the direction of the force that is causing it. This can happen when the energy source is being drained or is functioning in reverse.