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
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 |
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