Question

Sandeep connected one end of bulb to battery's positive terminal with copper wire and negative terminal with plastic wire. But bulb is not glowing. What could be the reason behind this?

Answer 1

According to the Question :

Sandeep connected one end of bulb to battery's positive terminal with copper wire and negative terminal with plastic wire. But bulb is not glowing .

We have learnt that plastic is a bad conductor also called as an insulator which doesn't let electricity to pass through it . And we learnt that electricity must pass through positive to negative terminal in order to get the light bulb lit . But when negative terminal is an insulator ; of course the bulb will not glow .

One thing to note is that plastic doesn't have free ions which will conduct electricity and let it pass through . Thus , an insulator .

Hence the bulb doesn't glow.

Answer 2

The reason behind the mentioned incident, is as follows -

• For a bulb to glow, we need to successfully attach the two terminals of the bulb with the two terminals of the battery. These connections should allow the flow of electricity from the battery to the bulb.
• Now, we know that plastic cannot conduct electricity because it is an insulator substance. (poor conductivity = insulator)
• That's why, the electricity flow between the negative terminal of the battery and the second terminal of the bulb, doesn't take place.
• And, with one terminal with the flowing electricity, a bulb cannot glow.
• That's why, the bulb is not glowing, in the described situation in the question.