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Tag Archives: electricity
What are LED lamps and what is there advantage over other lamps?
Superconductors are those substances that conduct electricity without any resistance, so why cant we use them in transmitting electricity?
Abdul Najeeb asked
i want to know more about Loop quantum gravity and tz implications on gravity, time, space and how will it change our perspective on big bang???????
Anju SV asked:
The magnets of earphones are of opposite polarities at left and right ears.why?
Why do we see the same face of moon always?
what is big bang?had it really happened?if it did,where is the proof?is it correct to say that earth and other celestial bodies were formed of this process?
Why does masses attract each other even though they are separated by even vacuum ?
why does the earth’s magnetic field flip?
Anuja M Bose asked
Is it possible to travel back in time using a time machine and interact with the people who lived in that period?
1.Is there any body on this universe known to man which is purely frictionless?
2.Is it true that light travels in the same(relative to us) speed even if we are going away from or towards it?Is this proved by experiments and is this phenomena the basis for time travel?
Gokul R Pillaiasked
Sir, I have learnt that the black hole finally opens into a white hole. If it is so, then how much distance would the objects attracted by the black hole travel, before they come out through the white hole?
Is it true that a person touching a high power line get struck with the line?
Ya, This is due to the strong contraction of the muscles making the person not at all able to release the wire or object from which he got the shock. Not due to any type of attraction arising out of electricity.
Humid air contains water droplets and make it conducting. Humid air defects static electricity experiments in two ways,
(1) It reduces friction
(2) It carries away the charges on rubbed bodies.
“What is meant by potential difference?”
“Potential Difference between two points is the difference in Potential between the two points and is equal to the work done per unit charge ion carrying a positive test charge from one point to another against the electric field and without any acceleration”
The resistances of 2 bulbs are in the ratio 1:2.if they are joined in series,find the ratio of the energy consumed by the 2 bulbs?
When connected in series, the same current flows through each of the resistors. Therefore, the energy dissipated is directly proportional to their resistances. That is, the ratio of energy dissipated will nbe same as the ratio of resistances. (1:2)
This question was posted by Chithraja. This is a common doubt arising naturally in the minds of children as well as adults who think. But they never ask, or if they ask the questions remain unanswered.
I will explain the question itself first. When we switch on a bulb we get the energy. But what happens to the electricity when we are not using it? Is it just wasted if we don’t use it?
Then, won’t it be better using as much of it when available rather than saving it by not using electrical appliances?
These are all associated questions which I have also asked several times.
Before I actually answer the question I am waiting for responses from visitors, students and teachers