Convert a galvanometer into an ammeter of range 0–1.5 ampere.
Apparatus Theory: A Galvanometers having a resistance G give full scale deflection when a current Igis passed through it. It can be converted into an ammeter of range (0 – 1) by connecting a suitable small resistance S in parallel with it (Fig.5.a).The value of the shunt resistance S is connected such that when this […]
Convert a galvanometer into a voltmeter of range 0 3 volts. Study the variation of resistance of a thermister with temperature
Apparatus Thermister ( ), test tube, thermometer, slide wire bridge, resistance box, galvanometer, rheostat, cell, tapping key and connecting wires. Pic? Theory A thermister is a heat sensitive resistor made from semiconductors. Usually thermisters have negative temperature coefficient of resistance, i.e., the resistance of a thermister decrease when its temperature is increase and rises when […]
Determine the resistance of a voltmeter.
Apparatus: Theory: Consider a battery of electromotive force E connected in series with a resistance R provided by a resistance box R.B. a key K and a voltmeter V whose resistance Rv Is to be determined. Usually a voltmeter is connected in parallel with a circuit, but here the voltmeter is connected in series and […]
Determine the resistance of galvanometer by half deflection method.
Apparatus Theory In half deflection method the galvanometer is connected to a cell through a high resistance R and its deflection is noted. The galvanometer is then shunted by connected a fractional resistance box across it and the shunt resistance is adjusted to reduce the deflection to half of its original value. It means that […]
Determine the resistance using a slide wire bridge of given wire
Apparatus ? Fig.1 (a) Theory Determination of an unknown resistance by slide wire bridge or meter bridge is based on the principle of Wheatstone bridge .A Wheatstone bridge consist of four resistance P,Q,R and X Connected to form a network ABCD .A galvanometer G is connected between points B and D and a cell […]
