Electromotive Force Calculator:
Enter the values of work done W(J) and charge Q(C) to determine the value of electromotive force, E(V).
Electromotive Force Formula:
Electromotive force (EMF) is the voltage generated by a battery or by the magnetic force according to Faraday’s Law. It drives the flow of electrons in a circuit.
Electromotive Force, E(V) in volts is calculated by dividing the work done W(J) in joules by the charge Q(C) in coulombs.
Electromotive Force, E(V) = W(J) / Q(C)
E(V) = electromotive force in vols, V.
W(J) = workdone in joules, J.
Q(C) = charge in coulombs, C.
Electromotive Force Calculation:
1. A battery does 100 joules of work to move 20 coulombs of charge. Calculate the EMF of the battery.
Given: W(J) = 100J, Q(C) = 20C.
Electromotive Force, E(V) = W(J) / Q(C)
E(V) = 100 / 20
E(V) = 5V.
- An electromotive force (EMF) of 12 volts and a charge of 3 coulombs, calculate the work done by the power source.
Given: E(V) = 12V, Q(C) = 3C.
Electromotive Force, E(V) = W(J) / Q(C)
W(J) = E(V) * Q(C)
W(J) = 12 * 3
W(J) = 36J.