Resistivity in Electric Current – Class 10 Science Experiment

Chapter Name: Electric Current

Activity Name: Resistivity in Electric Current

Activity Description:

Resistivity in Electric Current - Class 10 Science Experiment

The experiment aims to investigate the relationship between the cross-sectional area of a conductor and the current flowing through it to understand how resistance varies with the cross-sectional area.

Required Items:

  1. Iron rods of equal lengths but different cross-sectional areas
  2. Circuit setup with an ammeter
  3. Connecting wires
  4. Power source

Step by Step Procedure:

  1. Collect iron rods of different cross-sectional areas but with the same length.
  2. Set up the circuit as shown in figure 14.
  3. Connect one of the iron rods between points P and Q in the circuit.
  4. Note the value of the current using the ammeter and record it in your notebook.
  5. Repeat the process with each of the other iron rods, noting the corresponding current values for each.
  6. Observe that the current flowing through the rod increases with an increase in its cross-sectional area.
  7. Based on the observations, conclude that the resistance of a conductor is inversely proportional to its cross-sectional area, i.e., R ∝ 1/A (at a constant temperature and length of the conductor).
  8. From equations (1) and (2), deduce that R ∝ l/A (at a constant temperature) and R = ρl/A, where ρ is the resistivity (specific resistance) of the material.

Experiment Observations:

Record the current values for each iron rod with different cross-sectional areas.

Precautions:

  1. Ensure all connections in the circuit are secure.
  2. Use iron rods of equal length for accurate comparisons.
  3. Take multiple readings to reduce errors and increase accuracy.
  4. Use appropriate safety measures while working with electrical circuits.

Lesson Learnt from Experiment:

The experiment demonstrates that the resistance of a conductor is inversely proportional to its cross-sectional area at a constant temperature. It also helps understand the concept of resistivity (ρ) as a material property, which influences a conductor’s resistance.

Science Experiment Kits for Kids

Photo Title Price Buy
Einstein Box Junior...image Einstein Box Junior Science Gift Set | 2-in-1 Set of My First Science Kit & Slime Kit for 4-6-8 Year Olds| Birthday Gift for Boys & Girls ₹1,199.00
ButterflyEdufields 20+ Science...image ButterflyEdufields 20+ Science Kit For Kids | STEM Projects birthday gift For Boys and Girls Ages 7-8-10-12 |DIY Educational & Learning Experiment Toys for 7 To 12 Year Olds | Build 20+ Motor Machines ₹1,614.05
The Little Ones...image The Little Ones Science Kit - Science experiment kit for kids 6-8-10-12 years old,educational learning toys,Best gift for boys&girls,chemistry kit,science project[Complete science kit- 100+experiment]
WitBlox AI Artificial...image WitBlox AI Artificial Intelligence Robotic Science Kit for 101+ Project 137 Part 8 Yrs+, Interlocking Bricks, Electronic Sensor & Circuits to create Logic 2 Free Live Classes Gift Toy for Boys & Girls ₹3,699.00
Avishkaar Robotics Advanced...image Avishkaar Robotics Advanced Kit|150-In-1 DIY Stem Metal Kit|Multicolor|150+ Parts|Learn Robotics|Coding & Mechanical Design|for Kids Aged 10-14|Made in India|Educational DIY Stem Kit|Made in India ₹10,199.00
My Science Lab...image My Science Lab Ultimate Science Experiment Kit for Kids Age 6-14 | STEM Toys | Physics Kit Set | Science & Fun 5-in-1 Projects | School Science Kit | Best Educational Birthday Gift Toys for Boys and Girls ₹1,199.00

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *