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Derive the relation between the current and the drift velocity of free electrons in a conductor. Briefly explain the variation of resistance of a conductor with rise in temperature.
An ammeter, together with an unknown resistance in series is connected across two identical batteries, each of emf 1·5 V, connected (i) in series, and (ii) in parallel. If the current recorded in the two cases be (1/2) A and (1/3) A respectively, calculate the internal resistance of each battery.
State Kirchhoff's rules. Use them to obtain the condition of balance for a Wheatstone Bridge.
Use Kirchhoff's rule to determine the currents flowing through the branches MN, TO and SP in the circuit shown in the figure.
Define electrical conductivity of a wire. Give its SI unit.
High current is to be drawn safely from (1) a low-voltage battery, and (2) a high-voltage battery. What can you say about the internal resistance of the two batteries ?
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