**1. Derive the formula for combination of resistors in series and parallel.**

**2. Describe the experimental procedure to determine the internal resistance of a cell using potentiometer.**

**3. Derive the formula for combination of cells in series, parallel and mixed grouping.**

**4. Derive the expression for balanced wheat stones bridge P/Q = R/S**

**5. Draw a neat and labelled diagram of a simple potentiometer used to measure the e.m.f of a cell and explain the experimental procedure.**

**6. How can a moving coil galvanometer is converted into:**

**a) an ammeter b) a voltmeter of given ranges**

**Draw labelled diagram, illustrate the conversion, and derive the value of resistor to be attached.**

**7. State Kirchaff’s I & II law .**

**8. A galvanometer coil has a resistance of 15Ohm and it shows full scale deflection for a current of 4 mA. How will you convert it into an ammeter of range 0 to 6A? (10 M ohm)**

**9. What would be the resistance of the resistor that is colour coded Red-Red-Orange?**

**10. A galvanometer with a coil of resistance 100Ohm and a scale having 100 division has a current sensitivity of 25micro Ampere per division. How will you convert it into an ammeter of range 0 to 5 A? [0.05 Ohm]**