NCERT Class 10 Science Activity 12.3 Solution Electricity | Activity 12.3 Class 10 Science Electricity

 NCERT Class 10 Science Activity 12.3 Solution Electricity | Activity 12.3 Class 10 Science Electricity

In this article, we will discuss activity 12.3 class 10 science. You will find a complete explanation with a conclusion.

After studying this activity 12.3 Class 10 Science Electricity, you will be able to solve Questions of Chapter 12 Electricity.

 

  

Activity 12.3 Class 10 Science

   · Complete an electric circuit consisting of a cell, an ammeter, a nichrome wire of length l, and a plug key.

    ·  Now plug the key. Note the current in the ammeter.

   ·  Replace the nichrome wire with another nichrome wire of the same thickness but twice the length that is 2l .

   ·  Note the ammeter reading.

   ·  Now replace the wire with a thicker nichrome wire of the same length l . A thicker wire has a larger cross-sectional area. Again, note down the current through the circuit.

   ·  Instead of taking a nichrome wire, connect a copper wire to the circuit. Let the wire be of the same length and same area of cross-section as that of the first nichrome wire. Note the value of the current.

   · Notice the difference in the current in all cases.

   · Does the current depend on the length of the conductor?

   ·  Does the current depend on the area of cross-section of the wire used?

      

Electric circuit

ObservationActivity 12.3 Class 10 Science

i. When the length of the wire is doubled(from l to 2l), the ammeter reading decreases to half of its previous value.

ii. When the nichrome wire is replaced with another nichrome wire of a larger cross-section area but of the same length l . the value of current increases.

iii. When nichrome wire is replaced with copper wire of the same length and same area of cross-section.

ExplanationActivity 12.3 Class 10 Science

This activity can be  explained on the basis of ‘Ohm’s law’

We know

`R=frac{V}{I}`

‘R’ is the resistance of the wire.

i.  The ammeter reading decreases to one-half when the length of the wire is doubled because the resistance is directly proportional to length[ R∝l]. So when the length is doubled, the resistance becomes doubled.

ii. The ammeter reading increases to doubled when the area of cross-section of the wire is doubled because the resistance is inversely proportional to the area of cross-section [`R∝frac{1}{A}`].

iii.  When nichrome wire is replaced by a copper wire of the same length and same area of cross-section, the ammeter reading increases because the resistance of copper is less than nichrome wire.

ConclusionActivity 12.3 Class 10 Science

Through this activity, we can conclude that the resistance

i.  Is Directly proportional to the length of the conductor.

ii. Is Inversely proportional to the area of cross-section of the conductor.

iii. Depends on the nature of its material.

 Related Topic for you

1. Next Activity-  Activity 12.4 Class 10 Science

2. Previous Activity -  Activity 12.2 Class  10 Science

3. Solution of Chapter 12 Electricity

4. Extra Questions of Chapter 12 Electricity

5. MCQ Questions of Chapter 12 Electricity