How electric charges generated by rubbing are different from the charges that make a bulb glow? [3 MARKS]

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Solution

Each point: 1 Mark

1. The electrical charges generated by rubbing are static. They do not move by themselves.
2. When charges move, they constitute an electric current.
3. Current in a circuit which makes a bulb glow, or the current that makes a wire hot, is nothing but a motion of charges.

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How electric charges generated by rubbing are different from the charges that make a bulb glow? [3 MARKS]

Fill in the following blanks with suitable words :

(a) Like charges ........ ; unlike charges ...........

(b) Rubbing glass with silk makes a .......... charge on the glass.

(d) The negatively charged particles which are transferred from one object to another during charging by friction is called .......

(e) The charging of an object by rubbing it with another object is called charging by ........

(f) In an electroscope, the aluminium leaves diverge because like charges .........

(g) ......... is provided in buildings to protect us from electric shocks due to any leakage of electric current.

(h) Lightning is nothing but an ......... spark.

(i) Each fragment of earth's crust is called a ........

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