Electric Current Through Conductors — Practice Quiz
Maharashtra Board · Class 11 · Physics
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What is the SI unit of electric current?
A current of 2 A flows through a conductor for 5 seconds. Calculate the total charge that flows through the conductor.
A wire has a resistance of 10 Ω. If a voltage of 5 V is applied across it, what is the current flowing through it?
The drift velocity of electrons in a metallic conductor is typically of the order of:
Sample Questions
According to Ohm's law, which of the following statements are correct?
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Current is directly proportional to voltage, Current is inversely proportional to resistance, Voltage is directly proportional to resistance, V = IR for ohmic conductors
Ohm's law states V = IR, which means: (1) V ∝ I (when R is constant), (2) I ∝ 1/R (when V is constant), (3) V ∝ R (when I is constant). Resistance is a property of the material and doesn't depend on current for ohmic conductors.
Two resistors of 4 Ω and 6 Ω are connected in series. What is their equivalent resistance?
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10 Ω
For resistors in series, the equivalent resistance is the sum of individual resistances: Rs = R₁ + R₂ = 4 Ω + 6 Ω = 10 Ω. In series combination, the same current flows through all resistors.
Two resistors of 4 Ω and 6 Ω are connected in parallel. What is their equivalent resistance?
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2.4 Ω
For resistors in parallel: 1/Rp = 1/R₁ + 1/R₂ = 1/4 + 1/6 = 3/12 + 2/12 = 5/12. Therefore, Rp = 12/5 = 2.4 Ω. In parallel combination, the same voltage appears across all resistors.
The power dissipated in a resistor can be calculated using which of the following formulas?
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P = VI, P = I²R, P = V²/R
Power dissipated in a resistor can be calculated using three equivalent formulas: P = VI (basic power formula), P = I²R (when current is known), and P = V²/R (when voltage is known). These are derived from P = VI and Ohm's law V = IR.
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