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NON LINEAR RESISTANCE Name of Instructor: Mr. A. R. Ilangakoon Name : Perera K.N.S. Index No : 020287 Field : ENTC Date of Per. : 03/12/2003 Date of Sub.: 10/12/2003 CALCULATION Measurement of filament lamp RL = (V/I) × 1000 ? I (mA) VL (V) RL (?) 30 2.0 66.67 40 3.0 75.00 50 4.4 88.00 60 6.4 106.67 70 8.8 125.71 80 13.4 167.50 90 18.6 206.67 100 25.2 252.00 110 35.0 318.18 120 43.0 358.33 130 53.0 407.69 140 61.0 435.71 150 72.0 480.00 160 83.3 520.63 Measurement of standard resistor Standard resistance value = 58.0 ? RS = (V/I) × 1000 ? I (mA) VS (V) RS (?) 30 1.8 60.00 40 2.4 60.00 50 3.0 60.00 60 3.6 60.00 70 4.4 62.86 80 5.0 62.50 90 5.6 62.22 100 6.2 62.00 110 7.0 63.64 120 7.6 63.33 130 8.4 64.62 140 8.8 62.86 150 9.6 64.00 160 10.2 63.75 Measurement of standard resistor-filament lamp series combination RL = (VL/I) × 1000 ? RS = 1000 × (VS - VL)/I ? Total Resistance = R = (RL + RS) ? I (mA) VS (V) VL (V) RS (?) RL (?) R(?) 30 4.4 2.6 60.00 86.67 146.67 40 6.0 3.6 60.00 90.00 150.00 50 8.2 5.0 64.00 100.00 164.00 60 10.4 6.6 63.33 110.00 173.33 70 13.8 9.4 62.86 134.29 197.14 80 18.8 14.0 60.00 175.00 235.00 90 24.6 19.0 62.22 211.11 273.33 100 31.0 25.6 54.00 256.00 310.00 110 40.0 30.8 83.64 280.00 363.64 120 49.0 40.4 71.67 336.67 408.33 130 60.0 50.3 74.62 386.92 461.54 140 70.0 60.2 70.00 430.00 500.00 150 80.0 70.1 66.00 467.33 533.33 160 90.0 80.0 62.50 500.00 562.50 Load line for the series circuit : VS = VL + I × RS -> VL = -IRS + VS The voltage drop across the lamp can be computed graphically by drawing the load line for the circuit and the V-I curve for the lamp in the same graph and taking the intersection point voltage. When I...

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