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Describe the internals of a light-emitting diode (LEO). Describe what happens internally when sufficient current is applied to activate LED.
What isthe device pictured? What purpose does it serve in an electrical circUit?-
Describe the action of the device as shown in the two diagrams.
NEC permits metal wireways for most industrial locations except where they can be exposed to severe physical damage or a corrosive environment. Where physical damage might occur, what additionally must be done to protect the wireway or conduit?
What single action indicates to you that the wire nut you're using to make a splice is either too large or too small? What indicates to you that it's the right size?
Describe the difference in usage between straight-bladed plugs and locking plugs.
at a particular instant the speedometer of a vehicle shows 30km/hr .it is the a}average speed b}instantaneous speed c}uniform speed d}non-uniform speed
Explain electrical conductivity of a conductor and give its S.I. unit. Write S.I. unit of magnetic flux. Is it a vector or a scalar quantity?
Define drift velocity and derive an expression for it?
a boy throws a ball of mass 20 kg vertically upwards.it raises to a maximum height of 100 m.at what height will the kinetic energy be reduced to 70%
Gaia hypothesis (J. Lovelock, 1969): The idea that as a whole Earth should be regarded as a living organism & that biological procedure stabilize the environment.
a uniform sphere of mass 2kg is kept in a fixed position by two strings AB and CD. AB is horizontal and CD is inclined at 30° to the vertical. calculate the tension in each string.
one coin is thrown upword from 100m top building with velocity 15m/s .2s later 2nd coin is dropped downword at what distance from top of building 2nd coin cross first? Ans) They
Calculation of number of atoms per unit cell The number of atoms per unit cell occurs on the crystal structure and the kind of basic elements (basis or pattern unit or motif) t
(a) Show that the total power in a 3-phase, 3-wire system using the two-wattmeter method of measurement is given by the sum of the wattmeter readings. Draw a connection diagram.
Derive the Einstein Relation From the laws of thermodynamics, electrons carry a thermal energy equal to 1/2 kT per degree of freedom. Use this value to derive the Einstein's r
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