# Hat is the potential difference between X and 65cm mark in the circuit

• looi76
In summary, potential difference, also known as voltage, is the difference in electric potential between two points in a circuit and is measured in volts. It is measured using a voltmeter connected in parallel to the circuit and is represented by the 65cm mark in the circuit. Potential difference is the driving force behind the flow of electric current and can be affected by factors such as the power source, components in the circuit, and resistance.
looi76

## Homework Statement

http://img152.imageshack.us/img152/696/1005200802ps4.png
The wire XY in the circuit is made of a material of high resistivity and uniform area of cross-section. What is the potential difference between X and 65cm mark in the circuit?

## The Attempt at a Solution

$$\frac{65}{100} \times 2 = 1.3V$$

Is this correct?

Last edited by a moderator:
i think 2 x 65/165 if not misunderstood, the whole length 165 cm.

The length of the wire is 100cm. and on that wire the mark is 65cm. Is my answer correct?

If the high-resistivity wire is just between X and Y, then yes it's 1.3 V.

## 1. What is potential difference?

Potential difference, also known as voltage, is the difference in electric potential between two points in a circuit. It is measured in volts (V) and represents the amount of energy per unit charge that is required to move a charge from one point to another.

## 2. How is potential difference measured?

Potential difference is measured using a voltmeter, which is connected in parallel to the circuit. The voltmeter will display the value of the potential difference in volts.

## 3. What is the significance of the 65cm mark in the circuit?

The 65cm mark represents a specific point in the circuit where the potential difference is being measured. It could be the distance from the positive terminal of a battery to a certain point in the circuit, or the distance between two points in a circuit where the potential difference is being compared.

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

Potential difference is the driving force behind the flow of electric current. A higher potential difference will result in a stronger flow of current, while a lower potential difference will result in a weaker flow of current. This is known as Ohm's Law: V=IR, where V is potential difference, I is current, and R is resistance.

## 5. What factors can affect the potential difference in a circuit?

The potential difference in a circuit can be affected by a few factors including the type of power source (battery or outlet), the number and type of components in the circuit, and the resistance of the circuit. Changes in these factors can alter the potential difference in the circuit.

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