Current Electricity — Important Questions
Maharashtra Board · Class 9 · Science
45 important questions from Current Electricity for Maharashtra Board Class 9 Science, with answers. Includes multiple choice and multiple correct.
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Important Questions from Current Electricity
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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