Resistance in a wire

The title of the Project: Resistance in a wire

Purpose of the work:

  • Identify the dependence of resistance in a wire on resistivity of the material, length of the wire and the cross-section area of the wire.

Expected results:

  • Resistance is directly proportional to the resistivity and length of the wire, and inversely proportional to the cross-section area of the wire. 

Practical part

This is how virtual laboratory looks like.

Virtual experiment.

Step 1. Change the resistivity. How does the resistance change? Make a conclusion.

Step 2. Notice that when you increase resistivity the wire gets more dots in it. These are the ions that make electrons scatter and as a result increase resistance.

Step 3. Change the length of the wire. How does the resistance change? Make a conclusion.

Step 4. Change the area of the cross section of the wire. How does the resistance change? Make a conclusion.

Conclusion

Resistance is directly proportional to the resistivity and length of the wire, and inversely proportional to the cross-section area of the wire.