By primarily using what simple machine did galileo come to the conclusion on the existence of friction?

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why the ammeter and voltmeter has a circle representation

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Why dies a small quantity of air introduced into the top of the barometer tube depress the level of mercury ?

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A solar collection has been installed to heat water. A large water tank has a volume of 5.0 x 105 cm3. The area of the solar collectors is 8m2. (2 meters by 3 meters). If the water in the tank starts out with a temperature of 30°C in the morning, what is its temperature in the evening after the sun has set?

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Explain the difference between isolation transformers and step up or step down transformer?

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Why a small stone and a big stone reach at the same time when they are made to fall through the same heights ?

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1.when a diode has its maximum resistance? 2.is ohm's applicable for an ac circuit?  

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What is L.D.R(light dependent resistor)

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Explain about Hydraulic brakes?

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I have energy of (220V*1A=)220W. I want to convert it into (12V*15A=)180W. Is this possible? If yes, then how?

4 Answers  

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Describe the Working of the Transistor?

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Explain what is a positron?

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