Current Electricity
Maharashtra Board · Class 9 · Science
Practice quiz for Current Electricity — Maharashtra Board Class 9 Science. MCQs and questions with answers to test your preparation.
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Quick Quiz: Current Electricity
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What is the SI unit of electric current?
According to Ohm's law, if the potential difference across a conductor is doubled while keeping temperature constant, what happens to the current?
What is the formula for calculating electric current?
In a series combination of resistors, which quantities are the same for all resistors?
Sample Questions
Which of the following are good conductors of electricity?
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Copper wire, Aluminum wire, Silver
Metals like copper, aluminum, and silver are good conductors because they have free electrons that can move easily. Glass and rubber are insulators with very high resistance and do not allow current to flow easily.
The potential difference between two points is 12V. If 3C of charge flows between these points, how much work is done?
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36 J
Work done = Charge × Potential difference. W = Q × V = 3C × 12V = 36J. This formula comes from the definition of potential difference as work done per unit charge.
What is the effective resistance when three 6Ω resistors are connected in series?
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18 Ω
In series combination, effective resistance = R₁ + R₂ + R₃ = 6Ω + 6Ω + 6Ω = 18Ω. Series connection increases the total resistance.
Which wire in domestic electrical connections brings current to our homes?
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Live wire
The live wire (red or brown insulation) brings current to our homes. The neutral wire (blue or black) returns the current, and the earth wire (yellow or green) is for safety purposes.
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