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 setState the definition of direct current.
Answer
Direct current is a current of constant magnitude flowing in one direction.
A charge of 0.5 C passes through a conductor in 5 s. Find the current.
Answer
Given: Q = 0.5 C, t = 5 s Formula: I = Q/t Step 1: I = 0.5 C / 5 s Step 2: I = 0.1 C/s Answer: I = 0.1 A…
A conductor carries a current of 1.5 A for 2 s. Find the charge passed.
Answer
Given: I = 1.5 A, t = 2 s Formula: I = Q/t, so Q = I × t Step 1: Q = 1.5 A × 2 s Step 2: Q = 3 C Answer: Q = 3 C…
A charge of 24 C passes through a motor coil in 0.8 s. Find the current.
Answer
Given: Q = 24 C, t = 0.8 s Formula: I = Q/t Step 1: I = 24 C / 0.8 s Step 2: I = 30 C/s Answer: I = 30 A…
Why is conventional current opposite to electron flow?
Answer
Conventional current is taken in the direction of flow of positive charge, from higher potential to lower potential. Electrons move in the opposite direction, from lower potential to higher potential.
State the relation between current, charge, and time.
Answer
Current (I) = Charge (Q) / time (t) Meaning: current is the rate of flow of charge. Units: I in ampere, Q in coulomb, t in second. Quick example: 6 C in 3 s gives I = 2 A.
How many electrons make up 1 coulomb of charge?
Answer
1 coulomb of charge is carried by 6.25 × 10^18 electrons. This comes from the charge on one electron, which is 1.6 × 10^-19 C.
A conductor has 3.75 × 10^19 electrons passing through it in 1 s. Find the current.
Answer
Given: n = 3.75 × 10^19, e = 1.6 × 10^-19 C, t = 1 s Formula: I = ne/t Step 1: I = (3.75 × 10^19) × (1.6 × 10^-19) / 1 s Step 2: I = 6 C/s Answer: I = 6 A…
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