Table of Contents
What is the resistance of a moving coil instrument?
– Quora A moving coil instrument has a resistance of 10 Ohms and gives full deflection when carrying a current of 50 mA. How can it be adopted to measure the voltage up to 750V and current up to 1000A?
What is the resistance of a 15 volt moving iron voltmeter?
A 15-volt moving iron voltmeter has a resistance of 300 ohms and an inductance of 0.12 Henry. The instrument reads correctly on DC and on AC at 36 Hz when it shows a voltage of 14.75 V. What will its reading for the same voltage at 100 Hz?
How much voltage do I need to deflection a meter?
If a meter has a coil resistance of 10 ohms and shows a full scale deflection at 1mA then it would require 10mV (E=IR or E=0.001 x 10 or E=0.01V (10mV)) across the coil to provide that deflection. To use the meter at higher voltages, resistance would need to be added in series with the meter to provide voltage drop.
What type of damping is used in moving coil instruments?
Damping employed in moving-coil instruments is perfect since an eddy current damping is used. Due to the application of intense polarized or unidirectional field, the stray magnetic field has no effect. PMMC type of instrument can be operated in direct current only.
– Quora A moving coil instrument has a resistance of 5 ohms & a full-scale deflection of 10 millivolts. How is the instrument used to measure current up to 10 amperes?
How do you calculate the resistance of a meter and shunt?
Since the meter you have is 10 mV full scale, you need a shunt with a voltage drop of 10 mV at 10 A. R = E/I = 0.01/10 = 1 milliohm. Now, that calculation really says that you want the resistance of the meter and shunt in parallel to be 1 milliohm.
What is the deflection of a 10 Ma moving coil?
A moving-coil instrument gives full-scale deflection of 10 mA, when a potential difference of 10 mV is applied across its terminals. To measure currents up to 100 A, the same instrument can be used