## Potential Difference and Work Done: Introduction

## FAQs on If a Unit Charge is Taken from One Point

1. State the relation between potential difference, work done and charge moved.

The relationship between potential difference, work completed, and charge moved is established above and is given by:

Potential Difference = work done / charge moved. ----------------------- (1)

Let's derive the equation mentioned above now.

The formula for the relationship between potential difference, work done, and charge moved is simple to find if we define 1 Volt of potential difference.

When one joule of work is expended to move one coulomb of electricity from one point to another, where another charge is located, a voltage difference of one volt is created between the two charges. 1 coulomb / 1 joule equals 1 volt.

Work completed or moved charges could make a difference.

2. When does "Work Done" equal "Zero"?

There are several circumstances where there is no work done. Let's examine each one in turn:

No displacement equals no work done, as we have already read in this article. No matter how much force is applied, there will be no work done if the body does not move as a result.

You might encounter situations where the force applied is zero in addition to when the displacement is zero. Suppose, for instance, that there is no external force acting on an ice cube as it floats freely on another slick surface. Since there is no force in this situation, there will be no work done.

The work completed will be zero when the direction of the applied force is perpendicular to the direction of the displacement. As we all know, W = F. d = F d cos, where the angle will be 90 degrees, making W = 0 as the value of cos 90 = 0, the angle between the direction of the force and displacement in this case is 90 degrees.

3. What happens when there is a connection between the battery and the circuit?

A potential difference is created between the ends of a conducting wire when it is connected to the battery terminals. An electric field is created throughout the conductor as a result of this potential difference.It draws the electrons towards the positive terminal of the battery, where they begin to move in that direction.

4. What is positive and negative work done?

Positive Work Done:

When the direction of the applied force and the direction of the displacement the object makes as a result of the applied force are the same, the work is considered to be positive. Think about a ball dropping towards the ground as an illustration. Gravity is causing the ball to fall in this instance. It is clear that the ball is falling in the same direction as the gravitational pull of the earth.

Negative Work Done:

when the direction of the applied force is the opposite of the direction in which the object is being displaced. Think about the same ball being thrown upwards, for instance. In that scenario, the ball is moving upward in opposition to the downward-pointing direction of acceleration.

5. What do you understand about electric potential?

The charge begins to flow from one conductor to another when two charged bodies come into contact. The electric potential is the electrical condition that controls the transfer of charge from one conductor to another when they are in contact. In the cases of water, heat, and fluids, level, temperature, and pressure are analogous to electric potential. Earth is a conductor with an infinite capacity for both receiving and giving electrical current without changing its potential.

Its potential is assumed to be zero. The positively charged conductor therefore has a higher potential for positive energy than the earth. The negative potential of a negatively charged conductor is less than that of the earth.

Electric potential V at point P is equal to W/Q when W joules of work are used to move the test charge Q coulomb from infinity to point P.

W=QV is the amount of work required to move a charge Q from infinity to a point P where the electric potential is V.