TABLE OF CONTENTS:
NUMERICAL BASED ON GALVANOMETER
Galvanometer is an instrument which is used to detect and measure small electric current in an electrical circuit.These galvanometers are used in the meter bridges and potentiometers where they indicate the null deflection or zero current .The galvanometer can be converted into an ammeter or voltmeter.Here, the numericals based on conversion of galvanometer into an ammeter is discussed.
CONVERSION OF A GALVANOMETER INTO AN AMMETER: NUMERICAL
NUMERICAL:
NUMERICAL-1
SOLUTION:
CONVERSION OF A GALVANOMETER INTO AN AMMETER:
SHUNT :
A resistor with a very low resistance connected in parallel with other resistor.Such type of resistor is called shunt resistance.It is made up of a material having low temperature coefficient of resistance.
SHUNT RESISTANCE
Numerical On Conversion of Galvanometer into an Ammeter-1
Numerical On Conversion of Galvanometer into an Ammeter-2
Numerical On Conversion of Galvanometer into voltmeter
Numerical On Conversion of Galvanometer into an Ammeter-4
CONVERSION OF GALVANOMETER INTO AMMETER-PRACTICE PROBLEMS
|
Problem number |
Galvanometer resistance (G) |
Full-scale deflection current (Ig) |
Desired ammeter range (I) |
Shunt resistance (S) |
|
1 |
50 Ω |
1 mA |
10 A |
? |
|
2 |
100 Ω |
500 μA |
5 A |
? |
|
3 |
25 Ω |
2 mA |
1 A |
? |
|
4 |
75 Ω |
1 mA |
20 A |
? |
|
5 |
60 Ω |
300 μA |
2 A |
? |
|
6 |
120 Ω |
200 μA |
10 A |
? |
|
7 |
30 Ω |
1.5 mA |
5 A |
? |
|
8 |
90 Ω |
400 μA |
15 A |
? |
|
9 |
50 Ω |
1 mA |
50 A
|
? |
|
10 |
200 Ω |
100 μA |
1 A |
? |
Solution for the above numerical Problems
|
Problem Number |
Solution |
Problem Number |
Solution |
|
1 |
0.005Ω |
6 |
0.0024Ω |
|
2 |
0.01Ω |
7 |
0.009Ω |
|
3 |
0.0501Ω |
8 |
0.0024Ω |
|
4 |
0.00375Ω |
9 |
0.001Ω |
|
5 |
0.009Ω |
10 |
0.02Ω |
Question 11:
A galvanometer coil has a resistance of 15 Ω, and the metre shows full-scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A?
Answer:
A shunt resistor of must be connected in parallel with the galvanometer.
Question 12:
A galvanometer coil has a resistance of 12 Ω, and the metre shows full-scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18 V?
Answer:
A resistor of R=5988 ohms must be connected in series with the galvanometer.
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