## defintion

$\Delta U=q+w$

connie 2C
Posts: 106
Joined: Thu Jul 11, 2019 12:17 am

### defintion

what is internal energy? i don't understand the concept of why q + w equals the change in internal energy

005162902
Posts: 102
Joined: Wed Sep 18, 2019 12:15 am

### Re: defintion

internal energy is the total energy of a closed system. Because the closed system doesn't get energy from its surroundings, internal energy is made up of the potential and kinetic energy the closed system has.

Omar Selim 1D
Posts: 108
Joined: Sat Jul 20, 2019 12:16 am

### Re: defintion

Internal energy is just the energy found within a system without any interference from the world beyond. It is the concept of energy only being from the kinetic and potential energy already found within a system

Lauren Tanaka 1A
Posts: 109
Joined: Sat Aug 17, 2019 12:18 am

### Re: defintion

The internal energy or ∆U is the energy found in the system or the total energy of a closed system. This can be found using the equation ∆U = q + w where q is heat and w is the amount of work.

Kayli Choy 2F
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

### Re: defintion

Additionally for this equation, if you need to find work and you are given pressure and change in volume, w = -Pexternal(delta V), and you can substitute this in for w in the larger equation of delta U = q + w. If q = 0, no heat is being added, and if w = 0, no work is being done on the system.

LNgo 1G
Posts: 100
Joined: Sat Aug 24, 2019 12:16 am

### Re: defintion

The energy from heat being added to the system is represented by q, while w represents the energy leaving the system due to work.

605395381
Posts: 50
Joined: Mon Jun 17, 2019 7:24 am

### Re: defintion

Internal energy is the total energy found in a system which is, as defined by the equation, the sum of heat plus work (a form of energy)