Resistance Per Unit Length of Wire | 2nd PUC Physics Lab Experiments #physicslab #physicsexperiments

Summary

This video introduces the first practical of second-year physics: determining the resistance per unit length of a wire. It explains the principle of Ohm's Law, describes the necessary apparatus including the battery eliminator, ammeter, voltmeter, variable resistor, plug key, and experimental wire, and details the correct circuit connections. The instructor demonstrates how to take accurate voltage and current readings, explains the calculation of current using the least count, and guides students through plotting an I–V graph to determine the wire's resistance. The video emphasizes careful measurement techniques and proper setup, making it a clear and practical guide for physics lab experiments.

Takeaways

• 😀 The experiment's aim is to find the resistance per unit length of a given experimental wire.
• 😀 The principle of the experiment is based on Ohm's Law: the current flowing through a conductor is directly proportional to the potential difference, assuming temperature and physical conditions remain constantKey takeaways generation.
• 😀 The key apparatus used in the experiment include the battery eliminator, ammeter, voltmeter, variable resistor (Rheostat), and an experimental wire.
• 😀 A battery eliminator is used to convert high voltage to low voltage and switch between AC and DC.
• 😀 An ammeter measures the current and connects with two terminals (positive and negative).
• 😀 A voltmeter measures the potential difference (voltage) and also has two terminals (positive and negative).
• 😀 A variable resistor (Rheostat) is used to control the resistance in the circuit, which directly affects the current flow.
• 😀 A plug key is used to start or stop the current flow in the circuit.
• 😀 The circuit connections must be carefully set up, with correct connections between the battery, ammeter, voltmeter, variable resistor, and experimental wire.
• 😀 The experiment involves taking readings of voltage and current, then plotting the voltage vs. current graph to find the resistance per unit length using the slope of the graph.