Electricity
Tamil Nadu Board · Class 10 · Science
Flashcards for Electricity — Tamil Nadu Board Class 10 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allWhat is electric current and how is it defined mathematically?
Answer
Electric current (I) is the rate of flow of electric charges through a conductor. It is defined as the amount of charge flowing through any cross-section of a conductor in unit time. Mathematically: I…
A charge of 12 coulomb flows through a bulb in 5 seconds. Calculate the current through the bulb.
Answer
Given: Q = 12 C, t = 5 s Using the formula: I = Q/t I = 12/5 = 2.4 A Therefore, the current through the bulb is 2.4 amperes. This means 2.4 coulombs of charge passes through every cross-section of the…
What is an electric circuit and what are its essential components?
Answer
An electric circuit is a closed conducting loop or path made of electrical wires and components that allows electrons to flow. Essential components include: (1) Power source (battery) - provides poten…
Differentiate between electric potential and electric potential difference.
Answer
Electric Potential: The amount of work done in moving a unit positive charge from infinity to a point against electric force. It is the property of a single point. SI unit: Volt (V). Electric Potenti…
Why is potential difference necessary for electric current to flow through a conductor?
Answer
Potential difference is the driving force for electric current. Charges naturally move from higher potential to lower potential (positive charges) or from lower to higher potential (electrons/negative…
The work done in moving a charge of 10 C across two points in a circuit is 100 J. What is the potential difference between these points?
Answer
Given: Q = 10 C, W = 100 J Using the formula: V = W/Q V = 100/10 = 10 volts Therefore, the potential difference between the two points is 10 V. This means 10 joules of energy is required to move 1 cou…
State Ohm's Law and write its mathematical expression.
Answer
Ohm's Law states: At constant temperature, the electric current flowing through a conductor is directly proportional to the potential difference between its ends, and inversely proportional to its res…
Calculate the resistance of a conductor through which a current of 2 A passes when the potential difference between its ends is 30 V.
Answer
Given: I = 2 A, V = 30 V Using Ohm's Law: R = V/I R = 30/2 = 15 Ω Therefore, the resistance of the conductor is 15 ohms. This means the conductor opposes the flow of current, and a potential differenc…
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