Chapter 11

NCERT
Class 10
Science
Solutions
7. 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.

Question:

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.

Answer:

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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