A moving cool milliameter having a resistance of 10 ohms gives full scale deflection when a current of 5 MA is passed through it. explain how this instrument can be used for measure (a) current uptown 1A, (b) voltage up to 5v
A moving cool milliameter having a resistance of 10 ohms gives full scale deflection when a...
2) For a galvonometer, the value of the current that gives a full scale deflection is 3 mA and the internal resistance of the coil in the galvanometer is 90 2. a) Find the shunt resistance Rs which allows this galvonometer to be used as a 5 A ammeter. b) Draw the circuit of the constructed 5 A ammeter and show the corresponding currents and resistance values in the circuit. c) When the scale shows 0.75 mA, what will be...
A galvanometer of resistance 100 Ω gives full-scale deflection when its current is 1.0 mA. It is used to construct an ammeter whose full-scale reading is 100 A. If the shunt resistor consists of a piece of 10-gauge copper wire (diameter 2.59 mm), what should its length be
1. (a) i. Briefly explain the three (3) main functions of instruments and give examples each. ii. Explain loading effects in a measurement system.(b) A Maxwell bridge in Fig 1 below is used to measure an inductive impedance. The bridge constants at balance are:R1 = 235 kΩ, C1 = 0.012 µF, R2 = 2.5 kΩ, R3 = 50 kΩFind the series equivalent of the unknown impedance. 2. (a) The power input to a 3-phase induction...
A moving coil instrument has a resistance of 10ΩΩ and give a full deflection of 150 divisions with a p.d of 0.15V. Calculate the extra resistance required and show how it is connected to enable the instrument to be used as a voltmeter reading upto 15 volts. If the moving coil has a negligible temperature coefficient but the addedresistance has a temperature coefifcient of 0.004Ω/°C. Determine the reading that the p.d of 10V will give at 15°C, assuming instrument reads...
A 300 V voltmeter is specified to be accurate within ± 2% at full scale deflection. Calculate the absolute error and the percentage error when the instrument is used to measure a 120 V.
Y ou have available a galvanometer that gives a full-scale deflection for a 333-μA current and has a coil resistance of 33 Ω. (a) What shunt resistance is needed to convert this galvanometer to a 5.0-A ammeter? (b) What series resistance is needed to convert this galvanometer to a 5.0-V voltmeter?
Given a moving coil type measuring unit with: Internal resistance R= 1 kq; current for end-of- scale deflection in=0.01 mA. 41 [V] -411 [V] Using this unit, design a DC V-meter to show a half-scale deflection under the periodic input voltage given in the figure and having an internal resistance of R=10 kn/v.
A galvanometer has a coil with a resistance of 24.0 ?, and a current of 180 ?A causes it to deflect full scale. If this galvanometer is to be used to construct an ammeter that can read up to 10.0 A, what shunt resistor in micro-ohms is required?
Design a current divider/shunt resistance that will allow a lmA (full scale) 140 2 (internal resistance) d'Arsonval meter to measure 10mA at full scale (i.e. iunknown 10 mA, imeter 1 mA, Rmeter 140 , Rshunt?). NOTE: You may need to use up to two standard resistor values in series and/or parallel combinations to reach the needed shunt resistance. Lab values are: 10 22, 33, 47, 56, 68, 82, 100, 220, 330, 470, 560, 680, 820, lk, 2.2k, ..., IM2 Calculate...
moving-coil instrument, used as a voltmeter, has a coil of 150 turns with a width of 3 cm and an active length of 3 cm. The gap flux density is 0.15 T. If the full-scale reading is 150 V and the total resistance of the instrument is 100 000 Ω, find the torque exerted by the control springs at full scale. coil of a moving-coil instrument is wound with 40 turns. The mean width of the coil is 4 cm...