Question

1. Define potential drop and write it's mathematical expression and si unit. 2. Write mathematical expression for terminal voltage and si unit of terminal voltage
3. Write a mathematical expression relating emf,terminal voltage and potential drop.

Answer 1

the lose of potential in circuit due to impedance is called as potential drop.

V=IR and SI unit is Volt.

Mathematical expression of the terminal voltage is:

Vt= E-Ir

where r is the internal resistance, E is the emf and I is the current. SI unit of terminal voltage is Volt or Joul/coulomb.

relating equation of emf, terminal voltage and potential drop is

E= Vt + Ir