Question

What of the following can be used as ‘shunt’?
\[\begin{align}
  & A)Low\_\operatorname{Re}sis\tan ce \\
 & B)High\_\operatorname{Re}sis\tan ce \\
 & C)Both(A)\And (B) \\
 & D)None \\
\end{align}\]

Answer 1

Hint : Shunt is used with ammeter and galvanometer in parallel. When it is connected in parallel then it can be used to measure the heavy current and is able to convert galvanometer into ammeter so that galvanometer is able to flow large amounts of current through it because majority of current is flown to shunt.

Complete step-by-step solution:
Shunt: A resistor having a very low value of resistance such type of resistor is called shunt resistance. It is mainly made of the material having a low-temperature coefficient of resistance. To measure the heavy current in any device it is always connected in parallel with the ammeter so that range of ammeter is extended. When it is connected in parallel to the galvanometer then that galvanometer is also able to flow a large current through it and it is called shunted galvanometer because the galvanometer operates at low current because its main function is to detect the current in the circuit.
Temperature Coefficient: Temperature Coefficient of Resistance of any wire is a change in the electrical resistance of a substance per degree of the temperature change. The value of temperature coefficient is different for different materials and its SI unit is \[^{o}{{C}^{-1}}\] .
Shunt is connected parallel to the galvanometer (it is a current sensing device) in a circuit for measuring large current.
A low resistance because the shunt is a device having a low resistance and always connected in parallel. Due to its low resistance, more amount of current is passed through it and it is able to save any device that does not have sensors to receive a large current like in a galvanometer.
The S.I unit of shunt resistance is ohm.
So we can conclude from the above definition that Option A is correct.
Shunt is having low resistance so that it can draw the majority of the current in any circuit.

Note: Galvanometer is a device which is used to detect current in the circuit and it cannot be used to measure current or voltage .For measuring current or voltage in any circuit we should use ammeter and voltmeter. Ammeter is always connected in series combination while voltmeter is always connected in parallel combination.