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Chemical Effects Of Electric Current

Question

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(a) Identify the following figure and differentiate between LED and electric bulb.

(b) Expand the LED.

Solution

i) LED is shown in the figure.

Difference between LED and electric bulb:

Electric bulb	LED
1. Used to test only a strong current which is sufficient to heat the filament of bulb.	1. Used to test even when a weak electric current flows through it.
2. Glows only when large amount of current flows through it.	2. Glows even when a small amount of current flows through it.

(b) The full form of LED is Light Emitting Diode.

Some More Questions From Chemical Effects of Electric Current Chapter

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.

A child staying in the coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?

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