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Questions >> CBSE XII >> Physics >> Current Electricity

The storage battery of a can an ems of $12V$ .If the internal resistance of the battery is $0.4 \Omega$ What is the maximum current that can be drawn from the battery ?

asked Jun 29, 2015 by meena.p

1 answer

The resistivity of a typical insulator (eg: amber) is greater that of a metal by a factor of the order of $10^{22} /10^{23}$

asked Jun 29, 2015 by meena.p

1 answer

Alloys usually have lower/higher temperature is nearly independent of / increases rapidy with increase of temperature

asked Jun 29, 2015 by meena.p

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Alloys of metals have greater / lesser resistivity than that of their constituent metal?

asked Jun 29, 2015 by meena.p

1 answer

When electrons drift in a metal from lower to higher potential , does it means that all the free electrons of the metal are moving in the same direction ?

asked Jun 29, 2015 by meena.p

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If the electron drift speed is so small , and the electron's charge is small , how can we still obtain large amount of current in a conductor ?

asked Jun 29, 2015 by meena.p

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The electron drift arises due to the force experience by electrons in the electric field inside the conductor . But force should cause acceleration . When then do the electrons acquire a steady average drift speed ?

asked Jun 29, 2015 by meena.p

1 answer

The electron drift speed is estimated to be only a few $mms^{-1}$ for currents in the range of a few amperes. How then is current established almost instant a circuit is closed.

asked Jun 29, 2015 by meena.p

1 answer

Given n resistors each of resistance R, how will you combine them to get, (i) maximum effective resistance (ii) minimum effective resistance ? What is the ratio of the maximum to minimum resistance

asked Jun 29, 2015 by meena.p

1 answer

A high tension (HT) supply of say $6\;KV$ must have a very large internal resistance why ?

asked Jun 29, 2015 by meena.p

1 answer

Is Ohm's law universally applicable for all conducting element ? If not give example of elements which do not obey Ohm's law.

asked Jun 29, 2015 by meena.p

1 answer

A low voltage supply from which one needs high currents must have very low internal resistance why ?

asked Jun 29, 2015 by meena.p

1 answer

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