Current Electricity — Important Questions
ICSE · Class 9 · Physics
43 important questions from Current Electricity for ICSE Class 9 Physics, with answers. Covers Efficient Use of Energy and Social.
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Important Questions from Current Electricity
Which of the following are sources of direct current (DC)?
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Dry cell, Car battery, Mobile phone battery
Dry cell, car battery, and mobile phone battery are all sources of DC. House mains supply and AC generator provide alternating current (AC).
An insulator does not allow current to flow through it.
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True
True. Insulators like rubber, plastic, and glass do not allow current to flow through them because they have very few free electrons.
According to Ohm's law, if voltage increases and resistance remains constant, what happens to current?
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Current increases
According to Ohm's law V = IR, current I = V/R. If voltage increases and resistance is constant, current increases proportionally.
Primary cells can be recharged after use.
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False
False. Primary cells cannot be recharged. They are 'use and throw' type cells. Only secondary cells (accumulators) can be recharged.
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