CH-13 Current Electricity

The conventional current is due to the flow of:

When a pot difference of 4 Volt is applied across resistance, 10 J of energy is converted. Find charge flows:

Electric heater is the effect of electric current:

If a charge Q flows through any cross section of the conductor in time t, the current I is:

A constant temp, the current flowing through our conductor is directly proportional to the potential difference across its sand is called:

The magnitude of the drift velocity is of the order of:

When same current passes for the same time through a thick and thin wire:

The effect of bends in a wire on its electrical resistance are:

Went two spherical conducting balls at different potentials are joined by metallic wire, after some times, potential difference will be:

Heating effect of current is used in:

The vessel containing the two electrodes and the certain liquid is known:

The magnitude of magnetic effects depends upon:

The opposition offered by the conductor to the flow of current is called:

The SI unit of resistivity is:

The reciprocal of resistivity is:

The study of conductance of Electricity through liquids is known as:

Which of the following substance has got positive temperature coefficient of resistance:

To use a rehostat as variable resistor, the terminals which are inserted in a circuit are:

A temperature changes converts changes of temperature into:

When the current is being drawn from the battery:

The quantity having the same unit as that emf is:

A voltmeter can read the correct potential difference only when the current drawn by it from the cell is:

The unknown emf Ex, can be found by using potentiometer by formula:

The resistance of a conductor through which a current of one ampere is flowing when a potential difference across its ends is one volt is:

When the temperature of a conductor is raised, its resistance:

The resistance of the conductor increases due to rise of temp of a conductor because collision cross- section of the atoms:

The Fractional change in resistivity per unit original resistivity per Kelvin in temperature is known as:

The three resistor of resistance 2,3 and 6 Ohms are connected in parallel then their equivalent resistance is:

Super conductor has temperature coefficient.

Resistance and resistivity of a substance:

The electrical power in mathematical form can be expressed as:

If both fixed as well as the sliding contact of a rheostat are connected in a circuit, it is to be used as:

If the resistor is traversed in the direction of current, the potential change are:

When the Wheatstone bridge is balanced, the galvanometer shows zero deflection because:

Which one of the following instrument can measure the unknown resistance with sufficient accuracy:

An instrument which can measure potential without drawing any current is called:

The algebraic sum of potential changes for a closed circuit is zero according to:

The temp coefficient of resistance is positive for:

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

There are three equal resistances. How many different combination, of these resistance are possible:

Which one of the following is the unit of potential gradient:

In potentiometer, the length of its wire is doubled, the accuracy in determining the null point will:

Secondary cells are:

A wire of resistors R is cut into two equal parts, its resistance becomes R/2, what happens to resistivity:

The product of resistance and conductance is: