Question

what is emf ? what is SI unit of emf ? explain it's SI UNIT ​

Answer 1

Answer:

a system of physical units ( SI units ) based on the metre, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten........!!!

Answer 2

The SI unit of EMF is volt (V).

• EMF ( Electromotive Force) is not actually a force. It is the electric potential produced by an electrochemical cell or produced due to a changing magnetic field.
• Numerically, EMF = V + Ir

Here, V = Voltage of the cell

I = Current across the circuit

r = Internal resistance of the cell

• If a cell has zero internal resistance then E = V. Since the SI unit of the voltage of a cell is Volts,

       ⇒ SI unit of EMF is also Volts.

• EMF dimension is given as $ML^2T^-^3A^-^1$
• When 1 joule of work is done per unit coulomb charge, we say that 1 volt of electromotive force is used.