Question

1.define term EMF and its SI unit??
2.define terminal voltage and its SI unit??

Answer 1

Dear Student
Electromotive force (emf) is a measurement of the energy that causes current to flow through a circuit. It can also be defined as the potential difference in charge between two points in a circuit. Electromotive force is also known as voltage, and it is measured in volts.

In simpler terms a source that produces its own voltage has e.m.f.

What is Terminal Voltage?
Terminal voltage is the voltage / potential difference across the terminals of a cell or battery.

If the cell/battery is not connected to circuit then the terminal voltage/p.d is equal to the e.m.f of the cell or battery.
If the cell or battery is connected to a circuit then the terminal voltage/p.d is equal to the total voltage drop in the external circuit.

Its S.I. unit is Volt.

Regards