Ohm s Law and Electrical Resistance - Superconductors and Supercapacitors - Engineering Physics - 1

TL;DR

Ohm's law states current is proportional to voltage; electrical resistance measures current reduction through materials.

Transcript

hello friends in today's topic we will be learning about ohm's law and electrical resistance along with its numerical derivations and graphical significance ohm's law states that as long as physical properties of the conductor remains unchanged the amount of current flowing through a conductor is directly proportional to the applied voltage related... Read More

Key Insights

• ⚡ Ohm's Law states current is directly proportional to voltage in a conductor.
• 💐 Electrical resistance measures how materials reduce electric current flow.
• ⚡ The slope of the voltage-current graph represents the resistance of a conductor.
• 🛀 Linear devices follow Ohm's Law, showing a linear relationship between voltage and current.
• ⚡ Non-linear devices do not follow Ohm's Law, exhibiting curved voltage-current graphs.
• ❓ Examples of linear devices include metallic conductors and resistors.
• 🚱 Examples of non-linear devices include diodes and thermistors.

Questions & Answers

Q: What does Ohm's Law state?

Ohm's Law states that the amount of current flowing through a conductor is directly proportional to the applied voltage, as long as the physical properties remain unchanged.

Q: How is electrical resistance calculated?

Electrical resistance is calculated as the slope of the voltage-current graph, representing how much a conductor resists the flow of electrical charges.

Q: What is the difference between linear and non-linear devices?

Linear devices, like resistors, follow Ohm's Law, showing a direct relationship between voltage and current, while non-linear devices, like diodes, do not exhibit this proportional relationship.

Q: Can you give examples of linear and non-linear devices?

Examples of linear devices include metallic conductors and resistors, while non-linear devices include diodes and thermistors that do not follow Ohm's Law.

Summary & Key Takeaways

• Ohm's Law: Current is directly proportional to voltage in a conductor, as long as physical properties remain unchanged.

• Electrical Resistance: Measures how materials reduce electric current flow, quantified as resistance in ohms.

• Linear vs. Non-linear Devices: Linear devices follow Ohm's Law, showing a direct relationship between voltage and current.