Shrajesh thapa

Post office box is named as post Office box because the instrument was designed to

measure the resistance the telegraph wire in a post office.

Kirchhoff's first law is based on the principle Of conservation of charge and

is based on the principle of conservation energy.

We should not use Wheatstone bridge for measuring high resistance

because in this case we have to use a galvanometer of high internal

resistance. It will make low current flow through flow through the galvanometer

which will make it less sensitive.

When the circuit contains more than onesourceof emf and the current is

divided into many branches, the circuit will very complicated . Then

we cannot analyze the circuit by using only ohm's law. But in this case

Kirchhoff's laws simplify it to analyze the circuit.

Ohm's law can be used to analyze simple electric circuits only but it

cannot be used to analyze the complicated electric circuits containing

many components and loops. It can be done by using Kirchhoff's

So, Kirchhoff's laws are preferred over ohm's law in an electrical

because Kirchhoff's laws can used to analyze the circuits con

manysources of emf.

A meter bridge is also called a slide wire bridge because the jokey is

slided over the wire of one meter length in the bridge while doing the

experiment.

A slide wire bridge is called meter bridge because in a slide wire, wire of

one meter is used to form Wheatstone bridge and it works on

Wheatstone bridge principle.