# Why is potential difference the same across each branch in parallel?

• B
• aidandv
aidandv
As the title says, i am struggling to understand how if the cell is only supplying 3V how 2 lamps in parallel both receive 3 volts (totalling 6)

I currently study a level physics and never really questioned how this works and just accepted it as the truth.

Can someone explain with a helpful analogy?
thank you

In the standard circuit diagram, each lamp is connected to the battery with a straight lines and there are no other circuit elements between the lamps the battery terminals. Straight lines are equipotentials. Thus the potential has the same value ##V_1## on one side of both lamps and the same value ##V_2## on the other side of both lamps. That means that the lamps are in parallel.

DeBangis21

scottdave said:

Hi is there a specific timestamp for my question?

Motore
kuruman said:
In the standard circuit diagram, each lamp is connected to the battery with a straight lines and there are no other circuit elements between the lamps the battery terminals. Straight lines are equipotentials. Thus the potential has the same value ##V_1## on one side of both lamps and the same value ##V_2## on the other side of both lamps. That means that the lamps are in parallel.
So what youre saying is in parallel both components have the same potential for charge carriers to do work so theyre the same?

I am saying that two conductors in parallel have the same potential difference across their ends.

kuruman said:
I am saying that two conductors in parallel have the same potential difference across their ends.
i dont quite understand what this means

aidandv said:
i dont quite understand what this means
All the consumer elements in a car "feel" the 12 volts delivered by the car battery.
They are all in parallel to each other and having one consuming electricity does not affect what the other one is receiving.

aidandv said:
Hi is there a specific timestamp for my question?
So this addresses the concept of electric potential, rather than parallel circuits in particular. I think many students get confused on electric potential. There was another video that I was looking for concerning series and parallel circuits, but I haven't located it yet.

aidandv said:
As the title says, i am struggling to understand how if the cell is only supplying 3V how 2 lamps in parallel both receive 3 volts (totalling 6)
I think I see now what you mean. Here is the fluid analogy for a circuit. The potential difference across two conductors is analogous to the pressure difference across the constrictions. When you have two constrictions in parallel (bottom drawing taken from the link) the pressure difference between the ends is not additive. Likewise, if the potential difference (think of it as the pressure driving the flow of charge carriers) is not additive. In parallel conductors the currents are additive not the potential differences.

topsquark, Lnewqban and scottdave
I must be really dumb or smth bc I’m still not understanding. It’s ok tho dont worry about it

You may
aidandv said:
I must be really dumb or smth bc I’m still not understanding. It’s ok tho dont worry about it
You may be confusing voltage with current.

topsquark

## Why is potential difference the same across each branch in parallel?

In a parallel circuit, each branch is directly connected to the voltage source, meaning each branch experiences the same voltage as the source. This results in the potential difference across each branch being identical.

## How does the connection to the voltage source ensure the same potential difference?

Each branch in a parallel circuit connects directly to both the positive and negative terminals of the voltage source. This direct connection ensures that the potential difference across each branch is equal to the voltage of the source.

## Does the type of components in each branch affect the potential difference?

No, the type or value of components in each branch does not affect the potential difference across that branch. The potential difference remains the same because it is determined by the voltage source, not by the individual components.

## What happens to the current in a parallel circuit with the same potential difference?

In a parallel circuit, while the potential difference across each branch is the same, the current through each branch can vary depending on the resistance of the components in that branch. Higher resistance results in lower current and vice versa.

## Can potential difference change if one branch is disconnected in a parallel circuit?

If one branch is disconnected, the potential difference across the remaining branches stays the same because they are still connected to the voltage source. The overall current in the circuit may change, but the potential difference across each branch remains unaffected.

Replies
5
Views
963
Replies
2
Views
1K
Replies
2
Views
1K
Replies
7
Views
1K
Replies
7
Views
2K
Replies
7
Views
1K
Replies
9
Views
1K
Replies
24
Views
5K
Replies
15
Views
2K
Replies
5
Views
4K