In reality, the electromotive force is not a force but a measure of energy. The source converts one form of energy into electrical energy. For example, a battery converts chemical energy, and a generator converts mechanical energy. The term electromotive force was coined by Italian physicist and chemist Alessandro Volta, who invented the electric battery in 1800.
Electromotive Force (EMF) Equation
Electromotive Force (EMF) vs. Voltage
ε = IR + Ir Where, I: Current passing through the circuit R: Resistance of the resistor r: Internal resistance of the battery Symbol: ε, Greek letter epsilon Using Ohm’s law, V = IR Therefore, ε = V + Ir A voltmeter is used to measure the EMF. SI Unit The electromotive force is measured in Volt, which is its SI unit. A Volt is defined as Joule per Coulomb. Volt = Joule/Coulomb Dimension The dimension of electromotive force is [M L2 T-3 I-1]
