# Potential difference in junction of two cells one 4.5V and one 3V

• alexratman
In summary, the potential difference between two cells of 4.5V and 3V connected in parallel cannot be determined without more information. Additionally, connecting batteries of different voltages in parallel is not recommended as it can be dangerous. The concept of potential difference can be defined using the equation I = \frac{V}{R}.
alexratman
1. If two cells, one of 4.5V and one of 3V are connected in parallel what is the potential Difference across the junctions between them.
2. I = $$\frac{V}{R}$$
3. As 4.5v is greater it is the potential difference as they don't add up?

Last edited:
alexratman said:
1. If two cells, one of 4.5V and one of 3V are connected in parallel what is the potential Difference across the junctions between them.

2. I = $$\frac{V}{R}$$

3. As 4.5v is greater it is the potential difference as they don't add up?

Welcome to the PF.

As stated, the problem doesn't make sense yet. You wouldn't connect two batteries of different voltages in parallel directly -- that's a good way to start a fire.

What are "the junctions between them"? Is there a figure that goes with this question?

## 1. What is potential difference?

Potential difference, also known as voltage, is the measure of the difference in electric potential between two points in an electric circuit. It is measured in volts (V).

## 2. How is potential difference calculated?

Potential difference can be calculated by dividing the energy transferred by the charge that moves between the two points. It can also be calculated by multiplying the current by the resistance in the circuit.

## 3. What is the potential difference in a junction of two cells?

The potential difference in a junction of two cells refers to the difference in electric potential between the positive and negative terminals of the two cells. It is important to note that the potential difference between the two cells will depend on their individual voltages.

## 4. Why is the potential difference in a junction of two cells important?

The potential difference in a junction of two cells is important because it determines the direction in which current will flow in the circuit. This is because current always flows from a higher potential to a lower potential.

## 5. How does the potential difference change in a series circuit with two cells?

In a series circuit with two cells, the potential difference will add up. This means that the total potential difference in the circuit will be the sum of the individual potential differences of the two cells. In the case of a 4.5V and 3V cell, the total potential difference will be 7.5V.

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