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1) TO STUDY THE VARIATION OF RESISTANCE WITH THE NATURE OF MATERIAL
For this Nichrome and copper wires of same length (1m) and area of cross section(0.5mm) are taken. One of them (say nichrome) is connected in the circuit and the rheostat is adjusted to get a voltage(V) in the circuit. The corresponding ammeter reading(I) is noted and the ratio V/I=R is calculated. The procedure is repeated for different values of voltage with the same wire and in each case the ratio V/I is calculated and the mean value of R is found. Similarly the resistances of other materials are calculated.
2) TO STUDY THE VARIATION OF RESISTANCE WITH LENGTH OF THE CONDUCTOR
To study the effect of length of wire on resistance of the material , nichrome wires of different lengths (0.5m,1m,1.5m) but the same area of cross section are taken and are connected in the circuit one by one. The circuit is closed and rheostat is adjusted to get a voltmeter reading(V) and the corresponding ammeter reading(I).The procedure is repeated and the mean value of R is found for each length of wire.
3) TO STUDY THE VARIATION OF RESISTANCE WITH THE AREA OF CROSS SECTION OF THE CONDUCTOR To study the effect of area of cross section of the wire on wire on resistance of the material, copper or Nichrome wires of different areas of cross section are taken and are connected in the circuit one by one. The circuit is closed and rheostat is adjusted to get a voltmeter reading (V) and the corresponding ammeter reading (I). The procedure is repeated and the mean value of R is found for each area of cross section of the wire.
For this Nichrome and copper wires of same length (1m) and area of cross section(0.5mm) are taken. One of them (say nichrome) is connected in the circuit and the rheostat is adjusted to get a voltage(V) in the circuit. The corresponding ammeter reading(I) is noted and the ratio V/I=R is calculated. The procedure is repeated for different values of voltage with the same wire and in each case the ratio V/I is calculated and the mean value of R is found. Similarly the resistances of other materials are calculated.
2) TO STUDY THE VARIATION OF RESISTANCE WITH LENGTH OF THE CONDUCTOR
To study the effect of length of wire on resistance of the material , nichrome wires of different lengths (0.5m,1m,1.5m) but the same area of cross section are taken and are connected in the circuit one by one. The circuit is closed and rheostat is adjusted to get a voltmeter reading(V) and the corresponding ammeter reading(I).The procedure is repeated and the mean value of R is found for each length of wire.
3) TO STUDY THE VARIATION OF RESISTANCE WITH THE AREA OF CROSS SECTION OF THE CONDUCTOR To study the effect of area of cross section of the wire on wire on resistance of the material, copper or Nichrome wires of different areas of cross section are taken and are connected in the circuit one by one. The circuit is closed and rheostat is adjusted to get a voltmeter reading (V) and the corresponding ammeter reading (I). The procedure is repeated and the mean value of R is found for each area of cross section of the wire.