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<h2 class="wp-block-heading"><strong>Introduction to Energy</strong></h2>



<h3 class="wp-block-heading"><img decoding="async" style="width: 60px" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-165.png" alt=""> Key Concepts</h3>



<ol class="wp-block-list">
<li>What is energy</li>



<li>Why do we need energy</li>



<li>When can we say that an object has the energy?</li>
</ol>



<h3 class="wp-block-heading"><img loading="lazy" decoding="async" width="74" height="61" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/Screenshot-2128.png" alt="introduction">Introduction</h3>



<h4 class="wp-block-heading"><strong>What is energy?</strong>&nbsp;</h4>



<p>Have you ever thought about what happens in the street light when it glows, what makes vehicles move, musical system when it has songs playing?&nbsp;</p>



<p>In street light, it is light energy. In vehicles, it is mechanical <a href="https://www.turito.com/learn/science/what-is-energy" data-type="link" data-id="https://www.turito.com/learn/science/what-is-energy">energy</a>, and in the sound system, it is sound energy. </p>



<p>Energy is standard in all these situations.&nbsp;&nbsp;</p>


<div class="wp-block-image">
<figure class="aligncenter size-full"><img loading="lazy" decoding="async" width="599" height="375" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/12/Engergies.png" alt="types of energy" class="wp-image-28564" srcset="https://www.turito.com/learn-internal/wp-content/uploads/2022/12/Engergies.png 599w, https://www.turito.com/learn-internal/wp-content/uploads/2022/12/Engergies-300x188.png 300w" sizes="auto, (max-width: 599px) 100vw, 599px" /></figure></div>


<h3 class="wp-block-heading"><img loading="lazy" decoding="async" width="65" height="60" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/Screenshot-2130.png" alt="biosphere">Explanation</h3>



<h4 class="wp-block-heading"><strong>But what is energy?</strong>&nbsp;</h4>



<p>Definition: In physics, energy is regarded as the capacity to do work. In general, energy is the utility of the body to do some work like moving, heating, etc.&nbsp;</p>



<p>Energy is represented by E, and the unit of the energy is Joules in the SI system.&nbsp;</p><div class="fillWidthInMob"><a loading='lazy' class="showAdInAllRes"  data-toggle="modal" data-target=#homeLeadForm data-heading="Get Expert Guidance" href="#"><img class="img-fluid" alt="parallel" src=https://a.storyblok.com/f/128066/1100x230/00b28b4876/11-applying-for-collages_leaderboard-1100x230.jpg /></a></div>



<h3 class="wp-block-heading"><strong>Energy resources:</strong>&nbsp;</h3>



<ol class="wp-block-list">
<li>Renewable energy&nbsp;</li>
</ol>



<ol class="wp-block-list" start="2">
<li>Non-renewable energy&nbsp;</li>
</ol>



<h3 class="wp-block-heading"><strong>Renewable energy&nbsp;</strong>&nbsp;</h3>



<p>Renewable energy is sometimes called ‘clean’ energy, it is from nature, and it is ‘on-depleting&#8217; and can be used again and again.&nbsp;</p>


<div class="wp-block-image">
<figure class="aligncenter size-full"><img loading="lazy" decoding="async" width="464" height="224" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-535.png" alt="E.g., Solar energy, tidal energy and wind energy " class="wp-image-2446" srcset="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-535.png 464w, https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-535-300x145.png 300w" sizes="auto, (max-width: 464px) 100vw, 464px" /></figure></div>


<p class="has-text-align-center"></p>



<h3 class="wp-block-heading"><strong>Non-renewable energy:</strong>&nbsp;</h3>



<p>The energy which is not used again and again and depletes once used are called a non-renewable energy source.&nbsp;</p>


<div class="wp-block-image">
<figure class="aligncenter size-full"><img loading="lazy" decoding="async" width="366" height="224" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-534.png" alt="E.g., Coal, petroleum and natural gas " class="wp-image-2445" srcset="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-534.png 366w, https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-534-300x184.png 300w" sizes="auto, (max-width: 366px) 100vw, 366px" /></figure></div>


<p class="has-text-align-center"></p>



<h2 class="wp-block-heading"><strong>Why do we need energy?</strong>&nbsp;</h2>



<h3 class="wp-block-heading"><strong>Situation:</strong>&nbsp;</h3>



<p>Let us consider a restaurant which serves food to its customers daily. The restaurant makes food to meet the need of the customers.&nbsp;</p><div class="fillWidthInMob"><a loading='lazy' class="showAdInAllRes"  data-toggle="modal" data-target=#homeLeadForm data-heading="Get Expert Guidance" href="#"><img class="img-fluid" alt="parallel" src=https://a.storyblok.com/f/128066/1100x230/00b28b4876/11-applying-for-collages_leaderboard-1100x230.jpg /></a></div>



<p>Can you say what type of <a href="https://www.turito.com/learn/science/energy">energy</a> they need to prepare food for the customers?&nbsp;</p>


<div class="wp-block-image">
<figure class="aligncenter size-full"><img loading="lazy" decoding="async" width="636" height="288" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-540.png" alt="energy in cooking" class="wp-image-2451" srcset="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-540.png 636w, https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-540-300x136.png 300w" sizes="auto, (max-width: 636px) 100vw, 636px" /></figure></div>


<p>Can you list out various forms of energy resources that are used by the restaurant to meet its needs?&nbsp;&nbsp;</p>


<div class="wp-block-image">
<figure class="aligncenter size-full"><img loading="lazy" decoding="async" width="639" height="288" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-536.png" alt="restaurant" class="wp-image-2447" srcset="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-536.png 639w, https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-536-300x135.png 300w" sizes="auto, (max-width: 639px) 100vw, 639px" /></figure></div>


<h4 class="wp-block-heading"><strong>The restaurant needs:</strong>&nbsp;</h4>



<ol class="wp-block-list">
<li>Light energy to prepare food as they cannot prepare food in the dark.&nbsp;</li>
</ol>



<ol class="wp-block-list" start="2">
<li>The heat energy to prepare food in time.&nbsp;</li>
</ol>



<ol class="wp-block-list" start="3">
<li>Muscular energy to prepare raw materials and another service.&nbsp;</li>
</ol>



<ol class="wp-block-list" start="4">
<li>The electric energy for the working of the machinery.&nbsp;</li>
</ol>


<div class="wp-block-image">
<figure class="aligncenter size-full"><img loading="lazy" decoding="async" width="637" height="288" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-541.png" alt="restaurant energy" class="wp-image-2452" srcset="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-541.png 637w, https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-541-300x136.png 300w" sizes="auto, (max-width: 637px) 100vw, 637px" /></figure></div>


<h4 class="wp-block-heading"><strong>We need energy:</strong>&nbsp;</h4>



<p>We all need the energy to do our daily works without interruption. Everything on the earth possesses energy; hence, all the objects on the earth have some <a href="https://www.turito.com/learn/physics/energy-and-its-types">energy</a> or wants at some point to do work.&nbsp;</p>


<div class="wp-block-image">
<figure class="aligncenter size-full"><img loading="lazy" decoding="async" width="440" height="336" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-543.png" alt="sun" class="wp-image-2454" srcset="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-543.png 440w, https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-543-300x229.png 300w" sizes="auto, (max-width: 440px) 100vw, 440px" /></figure></div>


<p>Energy is not only on the Earth but in space also. Every object has energy.&nbsp;</p>



<p>E.g., Earth rotates around the Sun due to the energy and the light and heat from the Sun reaching the Earth from space.&nbsp;</p>



<h2 class="wp-block-heading"><strong>When can we say that a body has the energy?</strong>&nbsp;</h2>



<p>We can say that a body has energy when there is a useful work outcome.&nbsp;</p>



<p>Energy is regarded as the capacity to do work.&nbsp;</p>


<div class="wp-block-image">
<figure class="aligncenter size-full"><img loading="lazy" decoding="async" width="354" height="352" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-537.png" alt="hard work" class="wp-image-2448" srcset="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-537.png 354w, https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-537-300x298.png 300w, https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-537-150x150.png 150w" sizes="auto, (max-width: 354px) 100vw, 354px" /></figure></div>


<h3 class="wp-block-heading"><strong>Example:</strong>&nbsp;</h3>



<p>Let us consider a block lying on the floor. The block is at rest and not moving in any direction. We can say that the block has no energy as the block is not doing any work. It is at rest.&nbsp;</p>


<div class="wp-block-image">
<figure class="aligncenter size-full"><img loading="lazy" decoding="async" width="187" height="157" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-538.png" alt="book at rest" class="wp-image-2449"/></figure></div>


<p>Now, person A is moving the block from one place to another place, where the person needs to have the energy to move the block from one place to another.&nbsp;</p>


<div class="wp-block-image">
<figure class="aligncenter size-full"><img loading="lazy" decoding="async" width="338" height="165" src="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-539.png" alt="book moving" class="wp-image-2450" srcset="https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-539.png 338w, https://www.turito.com/learn-internal/wp-content/uploads/2022/08/image-539-300x146.png 300w" sizes="auto, (max-width: 338px) 100vw, 338px" /></figure></div>


<p>Therefore, we can say that the block and person A both possess energy as the person is using the energy to move the block from one place to another as useful work.&nbsp;</p>



<h2 class="wp-block-heading">Summary:<br></h2>



<p><strong>What is energy? </strong></p>



<p>Definition: In physics, energy is regarded as the capacity to do work. In general, energy is the utility of the body to do some work like moving, heating, etc. </p>



<p>Energy is represented by E, and the unit of the energy is Joules in the SI system.<br></p>



<p><strong>We need energy</strong>: </p>



<p>We all need the energy to do our daily works without interruption. Everything on the Earth possesses energy. Hence, all the objects on the Earth have some energy or want some energy to do work.<br></p>



<ul class="wp-block-list">
<li>Energy is not only on the Earth but in space also. </li>



<li>Every object has energy.<br>When can we say that a body has the energy? We can say that a body has energy when there is a useful work outcome. </li>



<li>Energy is regarded as the capacity to do work.</li>
</ul>
