Premium practical diagram for measurement of resistivity of a wire.
Why this practical matters
These experiments link current, potential difference, resistance, and energy in a clear lab circuit.
Measure the diameter more than once and average it so your area is more reliable.
What You Need
Apparatus
- power supply or cells
- ammeter and voltmeter
- variable resistor
- resistor, wire, thermistor, or bulb
- micrometer screw gauge
Key Formula
ρ = RA / l
Say the formula out loud before you start the calculation. It helps students and examiners follow your logic.
How To Do It
- Set up the measurement of resistivity of a wire apparatus neatly and make sure the scale or meter reading starts from a known point.
- Build the circuit neatly, check the meter polarity, vary one quantity at a time, and plot a graph where needed.
- Use the result to explain the physics idea in simple English. Measure the diameter more than once and average it so your area is more reliable.
Simple Explanation
Measure the diameter more than once and average it so your area is more reliable.
In the lab, we are not just collecting numbers. We are showing a physics rule in a real and reliable way. That is why careful setup, repeat readings, and clear labelling matter so much.
Common Mistakes
- Putting the voltmeter in series.
- Forgetting to switch off before changing the circuit.
- Using too high a current and heating the component too much.
Exam Tips
- Say which meter goes in series and which goes in parallel.
- Describe the graph shape, not only the readings.
- Mention why the circuit must be kept cool when needed.
- State the observation, the method, and the conclusion in that order.
Simulator / Quick Check
Measurement of Resistivity of a Wire simulator
Enter values and press Run.