• yaseen shah
In summary, potential difference, also known as voltage, is the difference in electrical potential energy between two points in an electric circuit. It is measured in volts using a voltmeter and is caused by the separation of positive and negative charges, which creates an electric field. Potential difference is directly proportional to the flow of electric current and can be negative if the direction of the current is reversed.
yaseen shah
yesturday I read in a book that it is not correct to say that p.d is the work done in moving a unit charge between the points concerned i can not understand that point please explain that!

Emf is the work done by a Source in moving a unit charge across a circuit. P.D. is energy dissipated by some component in a circuit (e.g. resistor). Its like energy going in:emf and energy going out:pd.

## 1. What is potential difference?

Potential difference, also known as voltage, is the difference in electrical potential energy between two points in an electric circuit. It is the driving force that causes electric charges to flow from one point to another.

## 2. How is potential difference measured?

Potential difference is measured in volts (V) using a voltmeter. The voltmeter is connected in parallel to the two points in the circuit where the potential difference is being measured.

## 3. What causes potential difference?

Potential difference is caused by the separation of positive and negative charges. This separation creates an electric field, which is the source of the potential difference.

## 4. How does potential difference affect the flow of electric current?

Potential difference is directly proportional to the flow of electric current. This means that the greater the potential difference, the greater the flow of electric current. Conversely, a smaller potential difference will result in a smaller flow of electric current.

## 5. Can potential difference be negative?

Yes, potential difference can be negative. This occurs when the direction of the flow of electric current is reversed. In this case, the negative sign indicates that the direction of the flow is opposite to the direction of the electric field.

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