Why we say that electrical energy is power over time p x t

  • #1
5
1

Main Question or Discussion Point

Greeting .

how electrical energy can be power over time when electrical energy is actually potential energy .

from a lot of sources (wiki ,study.com..) comes the information that electric energy is potential or kinetic energy in other sources is said to be electric power p x t so i am confused by this

Thank you.
 
Last edited:

Answers and Replies

  • #2
anorlunda
Staff Emeritus
Insights Author
8,587
5,476
:welcome:

It sounds like you are getting confused by definition of words.

Electrical energy is not like mechanical energy. Mechanical potential and kinetic energies are not like electric energy.

The electric potential is not energy.

One can say that power is rate of change of energy.

In order to have electric power flow, we must have both a potential difference (V) and current flow (I), P=V*I. If V is zero or if I is zero, then P is zero.


In words, power is to energy as speed is to distance. I assume you know how speed and distance are defined and how they relate to each other.
 
  • #3
5
1
:welcome:

It sounds like you are getting confused by definition of words.

Electrical energy is not like mechanical energy. Mechanical potential and kinetic energies are not like electric energy.

The electric potential is not energy.

One can say that power is rate of change of energy.

In order to have electric power flow, we must have both a potential difference (V) and current flow (I), P=V*I. If V is zero or if I is zero, then P is zero.


In words, power is to energy as speed is to distance. I assume you know how speed and distance are defined and how they relate to each other.

ok i understand what you men but what then wiki and study .com constantly saying the electrical energy is potential energy i will quote :

Electrical energy is potential energy, which is energy stored in an object due to the object's position. Well, in terms of electrical energy, the object is the charged particle, and the position is the location of that charged particle within the electric field. The charged particle will have the potential to move, or to do work, due to the force of the electric field.
 
  • #4
CWatters
Science Advisor
Homework Helper
Gold Member
10,529
2,295
Power is the rate at which energy is used so..

Power = ∆energy/∆time

Rearrange to give

∆energy = power * ∆time

This work for all forms of energy.
 
  • #5
anorlunda
Staff Emeritus
Insights Author
8,587
5,476
The wikipedia article applies to only one circumstance. That is when charged particles are brought closer together it takes energy to do that, and the electric potential is proportional to that energy.

There are other ways to create power, chemical energy is one, and moving a wire through a magnetic field is another. That wikipedia paragraph does not describe those.

In the future, if you cite a wikipedia article, also give a link to the article so that we can see the context.
 
  • #6
5
1
The wikipedia article applies to only one circumstance. That is when charged particles are brought closer together it takes energy to do that, and the electric potential is proportional to that energy.

There are other ways to create power, chemical energy is one, and moving a wire through a magnetic field is another. That wikipedia paragraph does not describe those.

In the future, if you cite a wikipedia article, also give a link to the article so that we can see the context.

this is not from wiki this is from study .com link is https://study.com/academy/lesson/what-is-electric-energy-definition-examples.html
 
  • #7
29,566
5,888
ok i understand what you men but what then wiki and study .com constantly saying the electrical energy is potential energy
It simply doesn’t matter. Power is the rate at which energy is transferred. It can be potential energy or kinetic energy or whatever. The type of energy transferred is not relevant, the rate at which it is transferred is always called power.
 
  • Like
Likes CWatters and SammyS
  • #8
5
1
It simply doesn’t matter. Power is the rate at which energy is transferred. It can be potential energy or kinetic energy or whatever. The type of energy transferred is not relevant, the rate at which it is transferred is always called power.
ok but i repeat again whay is then p x t called electrical energy how we can have 2 definition of electrical energy
 
  • #9
29,566
5,888
ok but i repeat again whay is then p x t called electrical energy how we can have 2 definition of electrical energy
There can be many equally valid mathematical expressions which all mean the same thing. That is largely what math is used for: determining many other formulas for the same thing. So if you wanted we could come with many more than just 2.
 

Related Threads on Why we say that electrical energy is power over time p x t

Replies
8
Views
1K
Replies
10
Views
1K
  • Last Post
2
Replies
34
Views
5K
  • Last Post
Replies
6
Views
9K
Replies
10
Views
2K
Replies
16
Views
3K
Replies
27
Views
9K
Replies
4
Views
853
  • Last Post
2
Replies
26
Views
6K
Top