A moving coil instrument having a resistance of , gives a full-scale deflection when the current is 10 mA. What should be the value of the series resistance, so that it can be used as a voltmeter for measuring potential difference up to 100 V?

A 0-1 Ampere moving iron ammeter has an internal resistance of and inductance of 0.1mH. A shunt coil is connected to extend its range to 0-10 Ampere for all operating frequencies. The time constant in milliseconds and resistance in of the shunt coil respectively are  

A (0-50A) moving coil ammeter has a voltage drop of 0.1 V across its terminals at full scale deflection. The external shunt resistance (in milliohms) needed to extend its range to (0 – 500A) is ____________.

Two ammeters X and Y have resistances of  respectively and they give full-scale deflection with 150 mA and 250 mA respectively. The ranges have been extended by connecting shunts so as to give full scale deflection with 15A. The ammeters along with shunts are connected in parallel and then placed in a circuit in which the total current flowing is 15A. The current in amperes indicated in ammeter X is_________.

An analog voltmeter uses external multiplier settings. With a multiplier setting of, it reads 440V and with a multiplier setting of, it reads 352V. For a multiplier setting of, the voltmeter reads

An ammeter has a current range of 0 – 5 A, and this internal resistance is. In order to change the range to 0 – 25 A, we need to add a resistance of        

A DC ammeter has a resistance of 0.1Ω and its current range is 0 – 100A. If the range is to be extended to 0 – 500A, the meter requires the following shunt resistance

A 1000 V DC supply has two 1-core cables as its positive and negative leads; their insulation resistances to earth are 4 MΩ and 6 MΩ, respectively, as shown in Figure. A voltmeter with resistance 50 KΩ is used to measure the insulation of the cable. When connected between the positive core and earth, the voltmeter reads

A galvanometer with a full scale current of 10mA has a resistance of 1000Ω. The multiplying power (the ratio of measured current to galvanometer current) of a 100Ω shunt with this galvanometer is

A Manganin swamp resistance is connected in series with a moving coil ammeter consisting of a milli-ammeter and a suitable shunt in order to

A 100µA ammeter has an internal resistance of 100Ω. For extending its range to measure 500µA, the shunt required is of resistance (in Ω)

For the circuit shown in figure, the internal resistance of the armatures as well as that of the current coil of the wattmeter are zero and the voltmeters have a very large figure of merit.  is a 6A full scale moving iron type meter.  is a commercial full wave rectifier type meter of full scale 5A.  is a 500V meter of the peak response type.  is a 300V PMMC type meter and W is an electrodynamometer type, 5A, 230V wattmeter. Determine the readings of  and W.

A d.c. voltmeter has a sensitivity of 1000 Ω/volt. When it measures half full scale in 100V range, the current through the voltmeter is

A moving coil galvanometer is made into a d.c. ammeter by connecting

A moving coil instrument, whose resistance is 5Ω and whose working current (for full-scale deflection) is 0.015A, is to be used, with a manganin shunt, to measure 100A. calculate the error caused by a 10℃ rise in temperature, if the temperature coefficient of copper and manganin are 0.004 ohm/℃, and 0.00015 ohm/℃ respectively.

Four ammeters, M1, M2, M3 and M4 with the following specifications are available.

A current of 1A is to be measured. To obtain minimum error in the reading, one should select meter

In the circuit of figure, ammeter  reads 12A and  reads 9A. will read ________________A.  

Two 100V full scale PMMC type dc voltmeters having figure of merits (FOM) of 10kΩ/V and 20kΩ/V are connected in series. The series combination can be used to measure a maximum dc voltage of _____________________V.