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]
