Category Archive: alternating currents

Jun 30

What does a rheostat control?

What does Rheostat controls? electron drift velocity or quantity of electrons? Rheostat

We know I=nAve
I=current
n=quantity of electron
A=conductor area
e=electron charge
v=drift velocity

(Asked  Partha)

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Jan 30

Random collection of Physics Viva Questions

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

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Sep 15

Why direct currents aren’t used in Home circuits?

How can an alternating current change its direction while moving in a wire or any conductor? Why direct currents aren’t used in Home circuits? RAHUL ASKED Answer: Alternating current is produced by rotating a coil in a strong magnetic field (or ...

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