Current Electricity
ICSE · Class 9 · Physics
Flashcards for Current Electricity — ICSE Class 9 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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Explore the full setWhat is electric current? Define it in terms of charge flow.
Answer
Electric current is the rate of flow of electric charge through a conductor. If charge Q flows through a cross-section in time t, then Current (I) = Q/t. It is a scalar quantity measured in amperes (A…
What is the SI unit of electric current and how is it defined?
Answer
The SI unit of current is ampere (A). 1 ampere = 1 coulomb/1 second. Current is 1 A if 1 coulomb of charge flows through a cross-section in 1 second. This means 6.25 × 10¹⁸ electrons pass through the …
Distinguish between conventional current and electronic current direction.
Answer
Conventional current flows from positive terminal to negative terminal (high potential to low potential). Electronic current is the actual flow of electrons from negative to positive terminal (low pot…
What is the difference between direct current (DC) and alternating current (AC)?
Answer
Direct current (DC): Current of constant magnitude flowing in one direction. Example: Cell, battery. Alternating current (AC): Current whose magnitude and direction change with time periodically. Exam…
Compare primary cells and secondary cells with three differences.
Answer
Primary cells: (1) Irreversible chemical reaction (2) Cannot be recharged (3) Use and throw type. Examples: Dry cell, Daniel cell. Secondary cells: (1) Reversible chemical reaction (2) Can be recharge…
What is potential difference? State its formula and unit.
Answer
Potential difference between two points is the work done in transferring unit positive charge from one point to another. Formula: V = W/Q, where W = work done, Q = charge transferred. SI unit: Volt (V…
State Ohm's Law and write its mathematical expression.
Answer
Ohm's Law: Current flowing through a conductor is directly proportional to the potential difference across its ends, provided temperature remains constant. Mathematical expression: V = IR or R = V/I o…
What is electrical resistance? What causes resistance in a metallic conductor?
Answer
Electrical resistance is the obstruction offered by a conductor to the flow of current. In metals, moving electrons collide with fixed positive ions and other free electrons, causing them to slow down…
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