How shunt decreases the sensitivity of galvanometer?
Since the Shunt bypasses part of the current, the result is reduction in sensitivity. The lower the resistance of the shunt the lesser the sensitivity of galvanometer and vice-versa the higher the resistance of the shunt the higher the sensitivity of the galvanometer.
What is the effect of shunt on current sensitivity?
If you want to measure higher current then you can connect a shunt resistor in parallel with the meter and have the two in series with the rest of the circuit. The two together (internal and shunt) will assure that a current smaller than the meter’s limit will flow through it.
What happens when a shunt resistor is connected with galvanometer?
A shunt connected in parallel with a galvanometer decreases the overall resistance of the ammeter.
Why shunt is connected in series to galvanometer?
A shunt resistance is connected in parallel to the galvanometer so as to keep the resistance low. Such low resistance galvanometer is used in series with the circuit to measure the strength of current through the circuit.
What effect does the resistance of the galvanometer have in the circuit?
The resistance of a galvanometer is 10Ω. It gives full-scale deflection when 1 mA current is passed.
What is sensitivity of a galvanometer?
The current sensitivity of a galvanometer is the deflection per unit current produced by the galvanometer. A high-sensitivity galvanometer can be used to measure very low values of currents. A low-sensitivity galvanometer can be used to measure high values of currents.
What is the effect of shunt resistance on total current of circuit?
Low shunt resistance causes power losses in solar cells by providing an alternate current path for the light-generated current. Such a diversion reduces the amount of current flowing through the solar cell junction and reduces the voltage from the solar cell.
What is shunt resistance in galvanometer?
Shunt resistance is used for converting a galvanometer into ammeter as most of the current will flow through it and only a small fraction of current will flow through the galvanometer, which is sufficient to make a deflection.
What is the function of shunt in a galvanometer?
A shunt is a low resistance connected in parallel to a circuit element. Functions of the shunt : (1) It lowers the effective resistance of the ammeter. (2) It shunts off a larger fraction of the line current, thus protecting the sensitive meter movement of the basic galvanometer.
What is galvanometer sensitivity?
What happens if shunt resistance is too small in galvanometer?
Now, if the shunt resistance is changed to a smaller value, then more current will flow in the shunt and less in the galvanometer, so the reading will be in error by being too small.
How to make a deflection in galvanometer?
Second option is putting a parallel resistance (shunt) with very small value so that most of the current flows through it and only a tiny portion of current will flow through galvanometer (as current always have a tendency to flow in less resistant path like you mentioned) which is sufficient to make the deflection.
What is the difference between ammeter and galvanometer?
Key is in knowing when to use which instrument: Galvanometer has a lower accuracy but a much higher sensitivity than ammeter. Also, galvanometer tells you the direction of current as well. If you want to measure a current then use ammeter. If you want to know if there is a current and which way its flowing then use galvanometer.
How do you calibrate a galvanometer?
A galvanometer is calibrated by choosing the correct shunt resistance. For example, if a galvanometer alone has a full scale sensitivity of 50 micro amperes and you want to make a meter with a full scale sensitivity of 50 milli amperes, you must choose a shunt resistance such…