Chapter 17, Problem 45A

Interpretation Introduction

Interpretation: The law of conservation of energy is to be explained.

Concept introduction: Following the laws of matter, the law of conservation of mass can be explained via symmetric chemical equations. In this instance, to balance a chemical equation is to ensure that the reactants and products have the same number of atoms in the equation.

Answer to Problem 45A

The Law of conservation of energy states that energy can neither be created nor be destroyed but it can only change from one form to another.

Explanation of Solution

The Law of conservation of energy states that the energy remains conserved. It can neither be created nor be destroyed but it can only change from one form to another.

When all forms of energy are considered, the total energy of an isolated system remains constant.

For example,

In an electrical bulb, we use electrical energy which in turn is converted into light and heat energy.

When fuels are burnt, chemical energy is converted into heat and light energy.

The microphone uses the conversion of sound energy to electrical energy.