Current Electri...

The common dry cell produces a voltage of:

A given resistor has the following colour scheme of the various strips on it : Brown, black, green and silver. Its value in ohm is :

Why is the Wheatstone bridge better than the other methods of measuring resistances?

Name the instrument used to control the current in an electric circuit.

Figure below shows a portion of an electric circuit with the currents in ampere and their directions. The magnitude and direction of the current in the portion $$PQ$$ is: 

When a 1 ohm resistor is connected across the potential difference of 20 V, what will be power dissipation in it?

The current in the primary circuit of a potentiometer wire is 0.5 A, $$\rho$$ for the wire is $$4 \times 10^{-7} \Omega -m$$ and area of cross-section of wire is $$8 \times 10^{-6} m^2$$. The potential gradient in the wire would be

A cell is used to :

E.M.F. ofa cell is expressed in

The unit of e.m.f. of a cell is: