Electric Potential and Potential Difference

Q.

What is the difference between knee voltage and breakdown voltage?

Q.

State and define the S.I. unit of potential difference.

Q.

Convert 1 eV to joule.

Q.

What is the SI unit of potential gradient?

Q.

The potential difference $\mathrm{V}$ across a cell of emf $\mathrm{E}$ and internal resistance $\mathrm{r}$ is ___________.

Q. What is the direction of electrons when an electric current is passed through a circuit?

1. From high potential to low potential
2. From low potential to high potential
3. In the direction of the current
4. In the direction of electric field

Q.

What do you mean by 1 volt?

Q.

The work done in moving a unit positive charge across two points in an electric circuit is a measure of _______.

1. Potential difference

2. Potential addition

3. Electric field

4. Electric power

Q.

Explain the concept of electric potential difference in terms of the work done in transferring the charge.

Q.

Calculate the potential difference across the ends of a wire with resistance $2ohms$ when a current of $1.5A$ passes through it.

1. $5V$

2. $3V$

3. $4V$

4. $1V$

Q.

A bird sitting on a high-power electric line is still safe. How, explain it briefly?

Q.

'The potential difference between two conductors is 1 volt. Explain the meaning of this statement.

Q.

Define the term potential difference?

Q.

Calculate the potential difference between two points, if 1500 J of work is done to carry a charge of 50C from one point to other?

1. 30 V

2. 10 V

3. 15 V

4. 5 V

Q.

defination and explination of potential difference

Q.

How do you calculate the charge on a capacitor?

Q.

The device which measures the electric potential difference between two points is called ___.

1. Ammeter

2. Voltmeter

3. manometer

4. water meter

Q.

In transferring 1.5 C charge through a wire, 9 J of work is needed. Find the potential difference across the wire.

Q. Calculate the amount of work done required in moving $14\times {10}^{20}$ electrons across two points of a wire with a potential difference of $28V$.

1. $3136J$
2. $6272J$
3. $3132J$
4. $6227J$

Q.

What is meant by the voltage drop across a cell?

Q.

The unit of potential difference is :

(a) ampere (b) volt

(c) ohm (d) coulomb.

Q.

The sun sends out a coronal mass ejection continuously towards earth having charged particles at the constant rate of $1.6\times {10}^{19}$ coulomb/sec throughout the day. Assuming that the sun and earth are maintained at a potential difference of 10, 000 volt, find the energy received by India in 5 days.
Given India receives 10 % of the energy received by the face of the earth.

1. 

2. 

3. 

4. 

Q. Identify the electrodes in the given diagram of an electric cell:

1. 
2. 
3. 

Q. Voltage drop across the conductor is having resistance $100\Omega$ and current flowing through it is $5A$.

1. $0.5V$
2. $5V$
3. $500V$
4. $50V$

Q. The direction of the flow of current through electric circuit is?

1. From low potential to high potential
2. From high potential to low potential
3. Does not depend upon potential value
4. Current cannot flow through circuit

Q. Two points have potentials of 10V and 5V respectively. The magnitude of the potential difference between the points is ___V.

Q. How much current will an electric geyser draw from a $220V$ source, if the resistance of the geyser is $110\Omega$?

1. $8A$
2. $1A$
3. $4A$
4. $2A$

Q.

Difference between electric potential and potential difference

Please tabulate 3 points

Q.

A toy train of mass 1 kg, starting from rest attains a velocity of $8\frac{m}{s}$ when connected to a battery of 8 volts for 4 s. Find the current in the circuit if the battery supplied a constant current during the 4-second interval. (Assume no energy loss due to friction)

1. 1 A

2. 2 A

3. 3 A

4. 4 A

Q. Do we have to include the signs (positive or negative)of the charges while solving problems?