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Chemical Effects Of Electric Current

Question

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Why does a bulb glow when electric current passes through it?

Solution

When electric current passes through a bulb, the filament of the bulb heats up to a high temperature. This is called heating effect of current. The temperature is so high that it starts glowing.

However, if the current through a circuit is weak, the filament does not get heated up sufficiently and it does not glow.

Some More Questions From Chemical Effects of Electric Current Chapter

Most liquids that conduct electricity are solutions of, and .

The passage of an electric current through a solution causes _________ effects.

If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the _________ terminal of the battery.

The process of depositing a layer of any desired metal on another material object by means of electricity is called _______________.

When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?

Name three liquids, which when tested in the manner shown in figure, may cause the magnetic needle to direct.

The bulb does not glow in the setup shown in figure. List the possible reasons. Explain your answer.

A tester is used to check the conduction of electricity through two liquids, labeled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that

Does pure water conduct electricity? If not, what can we do to make it conducting?

In case of fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.

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