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Electric Current & Ohm's Law Video Lecture | Physics for JEE Main & Advanced
FAQs on Electric Current & Ohm's Law Video Lecture - Physics for JEE Main & Advanced
| 1. What is electric current and how is it measured? |  |
Ans. Electric current is the flow of electric charge in a conductor. It is measured in units called amperes (A), which represent the rate of flow of charge. Amperes can be measured using a device called an ammeter, which is connected in series with the circuit to measure the current passing through it.
| 2. What is Ohm's Law and how is it applied in electrical circuits? | |
Ans. Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage across it, and inversely proportional to the resistance of the conductor. Mathematically, Ohm's Law is expressed as I = V/R, where I is the current, V is the voltage, and R is the resistance. This law is applied in electrical circuits to calculate the current flowing through a component or the voltage across it, given its resistance.
| 3. How does the resistance of a conductor affect the current flow in a circuit? | |
Ans. The resistance of a conductor determines the amount of current that can flow through it. According to Ohm's Law, as the resistance of a conductor increases, the current flowing through it decreases, and vice versa. A higher resistance restricts the flow of electrons, reducing the current, while a lower resistance allows more electrons to flow, increasing the current.
| 4. What are the factors that can affect the resistance of a conductor? | |
Ans. The resistance of a conductor depends on various factors, including the material of the conductor, its length, cross-sectional area, and temperature. Different materials have different resistivities, which determine their inherent resistance. Longer conductors have higher resistance, while larger cross-sectional areas result in lower resistance. Additionally, the resistance of most conductors increases with an increase in temperature.
| 5. How is Ohm's Law used to calculate the voltage across a resistor? | |
Ans. Ohm's Law can be used to calculate the voltage across a resistor by rearranging the formula V = IR. Given the current flowing through the resistor (I) and its resistance (R), the voltage (V) can be determined by multiplying the current and resistance values together. This allows engineers and electricians to analyze and design circuits by understanding the relationship between voltage, current, and resistance.
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