 # Electrical Circuits | Old is Gold | XII

#### Short Questions

1.      State Kirchhoff`s laws of circuits.
2.      Why does voltmeter measures current more accurately than an ammeter?
3.      What is Wheatstone bridge? Obtain the balanced condition for the bridge? Explain how resistance can be                      measured by a meter bridge?

#### Long Questions

1.      What is a Wheatstone bridge? Using Kirchhoff`s law, derive the principle of Wheatstone bridge.
2.      What is a potentiometer? Explain how you compare the emfs of two cells using a potentiometer.
3.      Discuss the principle of potentiometer and use it to determine the internal resistance of a cell.
4.      Discuss the principle of the potentiometer and use it to compare the emfs of two cells.
5.      Explain the principle of the potentiometer. How is this used to measure the internal resistance of a cell?
6.      State and explain Joule`s law of heating. Deduce an expression for the heat developed in a wire by the passage             of an electric current?
7.      What is potentiometer? How can you use it to measure internal resistance of a cell?
8.      What is internal resistance of a cell? How can you measure the internal resistance of a cell by using                                  potentiometer?
9.      What is the principle of potentiometer? Describe a method to measure the internal resistance of a cell by using            potentiometer.
10.     What is Wheatstone bridge? Derive the principle of Wheatstone bridge using Kirchhoff`s Law.