The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below :
I (amperes) 0.5 1.0 2.0 3.0 4.0
V (volts) 1.6 3.4 6.7 10.2 13.2
Plot a graph between V and I and calculate the resistance of that resistor.
Resistance = (V2 - V1)/(I2-I1)
R1 = (3.14 - 1.6)/(1.0 - 0.5)
R1 = 1.8/0.5
R1 = 3.5Ω
R2 = (6.7 - 3.4)/(2.0 - 1.0)
R2 = 3.3 / 1.0
R2 = 3.3Ω
R3 = (10.2 - 3.4)/(3.0 - 2.0)
R3 = 6.8 / 1.0
R3 = 6.8Ω
R4 = (13.2 - 10.2)/(4.0 - 3.0)
R4 = 3 / 1.0
R4 = 3Ω
R = (R1 + R2 + R3 + R4)/4
R = (3.5 + 3.3 + 3 + 6.8)/4
R = 16.6/4
R = 4.2Ω
Resistance = 4.2 Ω
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