Physics Practicals Class 12
Ohm’s Law and Resistance
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- In this simulation, you will learn about Ohm's law and apply the same to repair a weather station in your lab.
- You will use the knowledge about electrical resistance to find out what factors affect the resistivity of the conductor which will help you to find the right resistance for your application.
- All the experiment steps and procedures in Ohm’s law experiment like connecting wires, noting down the readings, graph plotting, voltmeter readings, etc., are highly interactive and have been simulated in a very similar manner as you do in a physics lab.
- This interaction provides a very immersive virtual reality environment and gives you a real-lab-like experience while conducting or performing experiments.
- You will experience a real-life scenario while doing the experiment.
According to Ohm’s law, “The current flowing through a conductor is directly proportional to the potential difference across its ends provided the physical conditions (temperature, dimensions, pressure) of the conductor remains the same.”
If 𝐼 be the current flowing through a conductor and 𝑉 be the potential difference across its ends, then according to Ohm’s Law, $$𝑉 ∝ I$$
$$𝑉 = 𝐼𝑅$$
where, 𝑅 is a proportionality constant known as the resistance of the conductor.
For a wire of uniform cross-section, the resistance depends on the length 𝑙 and the area of cross-section 𝐴. It also depends on the temperature of the conductor. At a given temperature the resistance, $$𝑅=𝜌\frac1A$$
where, 𝜌 is the specific resistance or resistivity and is the characteristic of the material of the wire.
Requirements for this Science Experiment
⦁ Ammeter ⦁ Voltmeter ⦁ Rheostat ⦁ Connecting Wires ⦁ Resistance Wire ⦁ Battery Eliminator