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What is Ohm's Law? Video Lecture | Crash Course: Class 10

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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, while inversely proportional to the resistance of the conductor. Mathematically, it can be represented as I = V/R, where I is the current, V is the voltage, and R is the resistance.
2. What are the three components of Ohm's Law?
Ans. Ohm's Law consists of three components: current (I), voltage (V), and resistance (R). Current refers to the flow of electric charge, voltage represents the potential difference between two points, and resistance is the opposition to the flow of current in a conductor.
3. How can Ohm's Law be applied to a circuit?
Ans. Ohm's Law can be applied to a circuit by using the formula I = V/R. By knowing the values of voltage and resistance, the current flowing through the circuit can be calculated. Similarly, if the current and resistance are known, the voltage can be determined using the formula V = I * R. This law helps in understanding and analyzing the behavior of electrical circuits.
4. What is the significance of Ohm's Law in everyday life?
Ans. Ohm's Law has significant importance in everyday life as it helps in various electrical applications. For instance, it allows us to calculate the current flowing through household appliances, determine the appropriate resistance for electronic devices, and understand the behavior of circuits in lighting systems. This law also forms the basis of electrical safety measures and helps in troubleshooting electrical problems.
5. Can Ohm's Law be applied to both AC and DC circuits?
Ans. Yes, Ohm's Law can be applied to both AC (Alternating Current) and DC (Direct Current) circuits. However, in AC circuits, where the voltage and current continuously vary with time, the concept of impedance (Z) is introduced instead of resistance (R). Impedance takes into account the effects of both resistance and reactance (associated with inductance and capacitance). Consequently, the Ohm's Law formula for AC circuits becomes I = V/Z.
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