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Ohm's Law and Resistance Video Lecture | Basic Physics for IIT JAM
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FAQs on Ohm's Law and Resistance Video Lecture - Basic Physics for IIT JAM
| 1. What is Ohm's Law? |  |
Ans. Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to its resistance. Mathematically, it can be represented as I = V/R, where I is the current in amperes (A), V is the voltage in volts (V), and R is the resistance in ohms (Ω).
| 2. How can Ohm's Law be applied to solve electrical circuits? | |
Ans. Ohm's Law is widely used in electrical circuit analysis to determine various parameters. By knowing the voltage across a component and its resistance, we can calculate the current flowing through it using Ohm's Law. Similarly, if the current and resistance are known, the voltage can be calculated. This law allows us to analyze and design circuits by understanding the relationship between voltage, current, and resistance.
| 3. What is resistance and how does it affect electrical circuits? | |
Ans. Resistance is the measure of an object's or material's opposition to the flow of electric current. It determines how much current will flow through a component for a given voltage. Higher resistance restricts the flow of current, causing a decrease in current. Conversely, lower resistance allows a larger current to flow. Resistance also generates heat in a circuit, which is useful in applications such as heating elements.
| 4. How is resistance measured and what are the common units? | |
Ans. Resistance is measured using an instrument called a multimeter. It can be set to measure resistance, and when connected to a component, it provides the resistance value in ohms (Ω). The common units of resistance are kilohms (kΩ), which is equal to 1000 ohms, and megohms (MΩ), which is equal to 1,000,000 ohms. Smaller units like milliohms (mΩ) and microohms (μΩ) are also used for very low resistances.
| 5. How does the temperature affect resistance? | |
Ans. Temperature has a significant impact on resistance. In most conductors, including metals, resistance increases as the temperature increases. This relationship is characterized by the temperature coefficient of resistance. On the other hand, some materials like semiconductors exhibit a decrease in resistance with increasing temperature. Understanding the temperature-resistance relationship is crucial for designing circuits, as it helps predict and compensate for changes in resistance due to temperature variations.
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Jan 25, 2025
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