Power is directly proportional as well as inversely proportional by two formulae.How does one justify?
P=V2/R as well as p=I2 R.
Answer:
This means that for a given current, (i.e, when current is
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Power is directly proportional as well as inversely proportional by two formulae.How does one justify?
P=V2/R as well as p=I2 R.
Answer:
This means that for a given current, (i.e, when current is
If 24 lights in a series around a circle are wired so that each one switches on as soon as it “sees” the one next to it go on, and switches off as soon as it “sees” the one next to it go off, will the pattern of lights revolve around the circle at a [...]
Two conducting wires X and Y of same diameter but different materials are joined in series across a battery . if the number density of electrons in X is twice that in Y . Find the ratio of drift velocity of electrons in the two wires. (Adithya Singh asked this) Incoming search terms:i want to [...]
We are starting a series of quizzes to enable the students to practice for online quizzes. Take the sample quiz below for getting an idea on how the quizzes will be coming. If you like it, let us know. Post your reactions as comment to this post. Based on the popularity, we will be adding [...]
You are given two nichrome wire of same length and different thickness Which wire will get heated first Give reason.? Asked Merlin Mary Mathew Answer: If the wires are connected one by one to a source, (or connected in parallel to the same source) the one having less resistance (Greater thickness) will get heated up first. [...]
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In a single slit diffraction pattern,
(Collected from Previous Board Question Papers and CBSE Sample Papers andGuess Papers made by experienced teachers)
Where does centre of curvature of a spherical mirror lie? Name two important properties of a magnet. How is 1 ohm related to ampere and volt? Draw neat ray diagrams to illustrate the formation of images due to a beam of light incident parallel to the principal axis of a (i) concave mirror, (ii) convex mirror in each case. Why is a series arrangement not used for connecting domestic electrical appliances in a circuit? Out of 60 W and 40 W lamps, which one has a higher electrical resistance when in use? Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed.(a) at F (b) Between F and O What is meant by the term, ‘magnetic field’? Why does a compass needle show deflection when brought near a bar magnet? Two lamps, one rated 60W at 220 V and the other 40W at 220 V, are connected in parallel to the electric supply at 220V.(a) Draw a circuit diagram to show the connections.(b)Calculate the current drawn from the electric supply.
(c)Calculate the total energy