Complete the following table based on Ohm's law Voltage (volt V) Current (ampere A) Resistance (ohm Ω ) 12 ...... 4 ....... 2 3 6 3 ......

Given, voltage V = 12 V Resistance R = 4 Ω Current can be calculated using the formula I = V R I = 12 4 = 3 A Now, in second case current I = 2 A resistance R = 3 Ω Voltage can be calculated using the formula V = I R V = 2 × 3 = 6 V o l t In third case Voltage V = 6 V current I = 3 A Resistance can be calculated using R = V I 6 3 = 2 Ω Voltage (volt V) Current (ampere A) Resistance (ohm Ω ) 12 3 4 6 2 3 6 3 2

Complete the table properly Component Measuring device Unit Potential difference Joule/coulomb ammeter ampere

Component Measuring device Unit Potential difference voltmeter Joule/coulomb Volt Current ammeter Coulomb/Second ampere Potential difference is measured using voltmeter and the unit of potential difference is volt. Potential difference is the amount of work done to carry unit charge from one point to other in an electric field. The rate of flow of charge is current. Current is measured using Ammeter and the unit of current is ampere.

Complete the table. The conductor is made of the same material. Length of conductor Area of cross-section of conductor Resistance of the conductor 1 cm 2 cm 2 10 Ω 2 cm ..... 20 Ω 1 cm 4 cm 2 .....

Given, Length of conductor = 1 cm Area of cross-section = 2 cm 2 Resistance of a conductor = 10 Ω Resistivity of a conductor can be calculated using the formula R = ρ l A , Where, ρ = Resistivity Substituting the values, resistivity of a conductor is calculated as 20 Ω cm The value of resistivity is same all the cases, as it is constant for a specific material. Length of conductor = 2 centimetre Let the area of cross-section = A Resistance of a conductor = 20 Ω Resistivity of a conductor as calculated is 20 Ω cm Area can be calculated using the formula R = ρ l A 20 = 20 × 2 A A = 2 cm 2 Now , Length of conductor = 1 cm A = 4 cm 2 R = ρ l A R = 20 × 1 4 = 5 Ω Length of conductor Area of cross-section of conductor Resistance of the conductor 1 cm 2 cm 2 10 Ω 2 cm 2 cm 2 20 Ω 1 cm 4 cm 2 5 Ω