Chapter 6, Problem 6.6P

Interpretation Introduction

Interpretation:

If the heater and air conditioner use the same amount of electrical energy to heat or cool the room respectively then the change in internal energy of the heater is larger, smaller, or the same as that of the air conditioner is to be determined.

Concept introduction:

According to the law of conservation of energy “the total energy of the system plus surrounding remains constant”. The expression of the law of conservation of energy is:

$\Delta E_{\text{universe}}=\Delta E_{\text{system}}+\Delta E_{\text{surrounding}}$

Or,

$\Delta E_{\text{universe}}=0$

Here,

$\Delta E_{\text{system}}$ is the internal energy of the system.

$\Delta E_{\text{universe}}$ is the internal energy of the universe.

$\Delta E_{\text{surrounding}}$ is the internal energy of the surrounding.