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Flashcards for JEE Physics - Current Electricity Class 12
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Page 1 Current Electricity Flash cards Page 2 Current Electricity Flash cards Electric Current (continued) It is the time rate of flow of charge through a conductor when there is net transfer of charge (say ?Q) across a cross section during a time interval (say ?t), we define average electric current as Page 3 Current Electricity Flash cards Electric Current (continued) It is the time rate of flow of charge through a conductor when there is net transfer of charge (say ?Q) across a cross section during a time interval (say ?t), we define average electric current as Electric Current (continued) The instantaneous current at any instant 't' as Page 4 Current Electricity Flash cards Electric Current (continued) It is the time rate of flow of charge through a conductor when there is net transfer of charge (say ?Q) across a cross section during a time interval (say ?t), we define average electric current as Electric Current (continued) The instantaneous current at any instant 't' as Electric Current (continued) Current is one of the seven fundamental quantities. The S.I. unit of current is ampere. Page 5 Current Electricity Flash cards Electric Current (continued) It is the time rate of flow of charge through a conductor when there is net transfer of charge (say ?Q) across a cross section during a time interval (say ?t), we define average electric current as Electric Current (continued) The instantaneous current at any instant 't' as Electric Current (continued) Current is one of the seven fundamental quantities. The S.I. unit of current is ampere. Electric Current (continued) The conventional direction of current is along the direction of flow of positive charge and opposite to motion of negative charge.Read More
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FAQs on Flashcards for JEE Physics - Current Electricity Class 12
| 1. What is current electricity? |  |
Ans. Current electricity refers to the flow of electric charge through a conductor. It is the movement of electrons in a closed circuit, creating a continuous flow of electric current.
| 2. What is the difference between alternating current (AC) and direct current (DC)? | |
Ans. Alternating current (AC) periodically changes direction, constantly reversing its flow. It is commonly used in household appliances and power grids. On the other hand, direct current (DC) flows in one direction only and is commonly used in batteries and electronic devices.
| 3. How is electric current measured? | |
Ans. Electric current is measured in amperes (A) using an ammeter. It measures the rate of flow of electric charge through a conductor. The symbol for electric current is "I".
| 4. What factors affect the resistance of a conductor? | |
Ans. The resistance of a conductor is affected by several factors, including the material of the conductor, its length, cross-sectional area, and temperature. Generally, longer and thinner conductors have higher resistance, while wider and shorter conductors have lower resistance. Additionally, different materials have different resistivities, which determine their resistance.
| 5. How does Ohm's Law relate to current electricity? | |
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, Ohm's Law is expressed as I = V/R, where I represents the current, V represents the voltage, and R represents the resistance.
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