Write principle of Wheatstone bridge.

Four resistors of resistance 15 Omega, 12 Omega, 4 Omega and 10 Omega arc connected in cyclic order to form a Wheatstone bridge. The resistance (in Q) that should be connected in parallel across the 10 Omega resistor to balance the Wheatstone bridge is

Write principle of calorimeter.

Write principle of superposition and explain.

Write the principle of rectifier.

Write the principle of transformer.

Why circuit given by Wheatstone is called Wheatstone bridge ?

Which unknown quantity is measured with the help of Wheatstone's Bridge ?

What is value of current flowing through galvanometer in balanced condition of Wheatstone bridge ?

What are the advantages of the null-point method in a Wheatstone bridge ? What additional measurements would be required to calculte R_("unknown ") by any onther method ?

Write principle of Homogeneity of dimension.