Current Electri...

The expression of resistance of  temperature dependence in a metallic wire is

When two resistors with resistances $$R_1$$ and $$R_2$$ are connected in series, then the total equivalent resistance is 

Equivalent resistance is more than either of the two resistances when they are in:

The e.m.f. of the cell is

The current $$I$$ and voltage $$V$$ graphs for a given metallic wire at two different temperatures $$T_1$$ and $$T_2$$ are shown in the figure. It is concluded that :

In a closed circuit the e.m.f. and internal resistance of the generator are $$E$$ and $$r$$ respectively. If the external resistance in the circuit is $$R$$, then the Ohm's law has the form :

A technician has $$10$$ resistors each of resistance $$0.1\ \Omega$$. The largest and smallest resistance that he can obtain by combining these resistors are:

If the temperature is increased, what will be the effect on the resistance of a conductor?

If in the experiment of Wheatstone's bridge, the positions of cells and galvanometer are interchanged, then balance point will

A cell of e.m.f. $$\varepsilon$$ and internal resistance $$r$$ sends current $$1.0 A$$ when it is connected to an external resistance $$1.9\, \Omega$$. But it sends current $$0.5 A$$ when it is connected to an external resistance $$3.9\, \Omega$$. Calculate the values of $$\varepsilon$$ and $$r$$.