A galvanometer has a resistance of 96 Ω and it is desired to pass 4% of the total current through it. The value of shunt resistance is ____?
A galvanometer has a resistance of 96 Ω and it is desired to pass 4% of the total current through it. The value of shunt resistance is ____?
Correct Answer: 4
Approach Solution - 1
It is given that,
The resistance of the galvanometer, Rg = 96Ω4% of the total current is passed through the galvanometer, i.e. Ig = 0.04
We have to find the value of shunt resistance.
Let Rs be the shunt resistance.
The shunt resistance is given by,
Hence, the correct answer is 4.
Approach Solution -2
Ans. An electromechanical device known as a galvanometer is used to measure and detect the electric current flowing through a circuit. By creating a rotatory deflection of the pointer in response to the electric current flowing through a coil set in a uniform and continuous magnetic field, a galvanometer essentially functions like an actuator. It is a sensitive instrument that can detect even very small currents, on the order of a few microamperes.
Principle of a galvanometer's operation - When a current-carrying coil is exposed to an external magnetic field, magnetic torque results. The amount of current flowing through the coil directly relates to the angle by which the coil is deflected as a result of the magnetic force.
Only little currents may be detected by a galvanometer. Thus, it is transformed into an ammeter to measure enormous quantities of current. Low resistance can be connected in parallel with the galvanometer to accomplish this
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Concepts Used:
Resistance
Resistance is the measure of opposition applied by any object to the flow of electric current. A resistor is an electronic constituent that is used in the circuit with the purpose of offering that specific amount of resistance.
R=V/I
In this case,
v = Voltage across its ends
I = Current flowing through it
All materials resist current flow to some degree. They fall into one of two broad categories:
- Conductors: Materials that offer very little resistance where electrons can move easily. Examples: silver, copper, gold and aluminum.
- Insulators: Materials that present high resistance and restrict the flow of electrons. Examples: Rubber, paper, glass, wood and plastic.
Resistance measurements are normally taken to indicate the condition of a component or a circuit.
- The higher the resistance, the lower the current flow. If abnormally high, one possible cause (among many) could be damaged conductors due to burning or corrosion. All conductors give off some degree of heat, so overheating is an issue often associated with resistance.
- The lower the resistance, the higher the current flow. Possible causes: insulators damaged by moisture or overheating.