What is an electric shock? It’s a a sudden discharge of electricity through a part of the body. For a sudden discharge of electricity, the prime need is a potential difference. When the bird perches on an electric line, it is at a high potential, but it is not subjected to a high potential difference between…… Continue reading Why don’t the birds perching on high power electric lines do not get an electric shock?
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As we know that in aeroplane during landing the charged produced in it due to the friction with ground are earthed through its wheels; can this charge be stored with the help of a capacitor and used for useful purpose? Answer: I feel that this is a metter for research. If you feel otherwise and…… Continue reading Can the frictional electricity produced during landing of a plane be used for constructive purposes?
State the Principle of a potentiometer. (The students say that potential drop is proportional to length but the constant quantities are not mentioned) How can we increase the sensitivity of a potentiometer? Define figure of merit of a galvanometer. Which has more resistance – a galvanometer or a milliammeter? How does an LED emit light?…… Continue reading Random collection of Physics Viva Questions
I have read that the FLOW OF ELECTRONS is called electricity. I wanna know that what is meant by flow of electrons? Pleaz answer me…. (Asked Kiruthika) Answer: Electric current is the flow of charges. (Measured as the rate of flow of charges). In conductors electric current is caused by the flow of free electrons. When a potential difference is…… Continue reading Electric Current and flow of electrons
Where is electricity stored after it is generated but before it is supplied? Mahesh Sable Electrical power cannot be stored and,therefore,power plants must produce power as and when demanded.power stations r connected in parallel hence load is equally distributed,electric Power can be adjusted with help of step up or step down transformers. Mathew Abraham…… Continue reading Where is electricity stored after it is generated but before it is supplied? (Chat Transcript from FaceBook)
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 […]