# Electric circuit 2 batteries

• Apteronotus
In summary, one can calculate the potential in an electric circuit with multiple batteries by looking at the outer circuit and applying KVL or KCL equations. The voltage between points A and B can be determined by considering the left battery connected to them. Internal resistances may also need to be taken into account in more complex circuits.

#### Apteronotus

How does one calculate the potential in an electric circuit when there are more than 1 batteries present?

For example, in the circuit attached, how would we calculate the potential at A and B?

Thanks,

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• Circuit2.JPG
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Apteronotus said:
How does one calculate the potential in an electric circuit when there are more than 1 batteries present?

For example, in the circuit attached, how would we calculate the potential at A and B?

Thanks,

Because the left battery is directly connected to A and B, that defines the voltage between A and B.

To the extent that the batteries are not ideal, you would show the internal resistances explicitly, and then solve the equations for the circuit. You can either use KVL or KCL equations. Are you familiar with them?

Berkeman,
Thank you for your explanation. I now understand the circuit. I guess the trick is to look at the outer circuit (not including the passive components) and apply KVL to it.

Thank you again,

Apteronotus

## 1. How do two batteries in an electric circuit work together?

When two batteries are connected in an electric circuit, their voltages add together. This means that the total voltage of the circuit is equal to the sum of the voltages of each battery. This can provide more power to the circuit and allow it to run for longer periods of time.

## 2. Can two batteries in an electric circuit be of different sizes or types?

Yes, two batteries in an electric circuit can be of different sizes or types. However, it is important to make sure that the batteries have the same voltage in order for them to work together effectively. If the batteries have different voltages, it can cause an imbalance in the circuit and potentially damage the components.

## 3. How do I connect two batteries in an electric circuit?

The batteries can be connected in two different ways in an electric circuit: series and parallel. In series, the positive end of the first battery is connected to the negative end of the second battery. In parallel, the positive ends of both batteries are connected together, as well as the negative ends. The type of connection will determine the total voltage and current of the circuit.

## 4. What happens if one of the batteries in an electric circuit dies?

If one of the batteries in an electric circuit dies, it will no longer contribute to the total voltage of the circuit. This will result in a decrease in power and the circuit may not function properly. It is important to replace the dead battery as soon as possible in order to maintain the proper functioning of the circuit.

## 5. Can two batteries in an electric circuit be connected in reverse polarity?

No, two batteries in an electric circuit should not be connected in reverse polarity. This means that the positive and negative ends of the batteries should not be switched. Connecting batteries in reverse polarity can cause a short circuit and potentially damage the batteries and other components in the circuit.