# Potential difference calculation

• ellieee
In summary, potential difference, also known as voltage, is the measure of the difference in electrical potential energy between two points in an electrical circuit. It is calculated by dividing the work done in moving a unit charge between two points by the magnitude of the charge. The SI unit for potential difference is volts (V), but it can also be measured in joules per coulomb (J/C) or electron volts (eV). Potential difference is directly related to electric current and is affected by factors such as resistance, material used, distance, and external factors like temperature and humidity.
ellieee
Homework Statement
for the 2 resistors in parallel, is is true that only need to find p.d across one of them (eg. (5.0)(1.0)=5.0V) to determine the p.d across both parallel resistors ? in this case (2.0.)(2.5) = (5.0)(1.0), but what If the p.d across resistor A not equal to that of B, then which resistor do you calculate the p.d of?
Relevant Equations
V=IR

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That cannot happen.

ellieee
For these types of school problems, a wire is considered to be 'perfect'; specifically that is: "The potential at any point on a wire is the same as the potential at any other point on that wire."

Keeping that in mind, since the respective ends of the two resistors A and B are connected by wire, they are at exactly the same potential.

Hope this helps!

Cheers,
Tom

ellieee

## 1. What is potential difference?

Potential difference, also known as voltage, is the difference in electric potential between two points in an electric circuit. It is measured in volts (V) and is the driving force that causes electric charges to flow from one point to another.

## 2. How is potential difference calculated?

Potential difference is calculated by dividing the work done in moving a unit charge from one point to another by the magnitude of the charge. This can be represented by the equation V = W/Q, where V is potential difference, W is work done, and Q is charge.

## 3. What factors affect potential difference?

The two main factors that affect potential difference are the amount of charge and the distance between the two points. The greater the charge, the greater the potential difference, and the greater the distance, the smaller the potential difference.

## 4. How is potential difference related to electric current?

Potential difference is directly related to electric current. A higher potential difference will result in a higher current flow, while a lower potential difference will result in a lower current flow. This relationship is described by Ohm's Law, which states that current is equal to potential difference divided by resistance (I = V/R).

## 5. How is potential difference used in practical applications?

Potential difference is used in various practical applications, such as in batteries to provide power to electronic devices, in power plants to generate electricity, and in electrical circuits to control the flow of current. It is also used in measuring devices, such as voltmeters and multimeters, to measure the potential difference between two points in a circuit.

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