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• Hi everyone! I'm Jayde and today we're going to talk about energy! But what is

• energy? Well all around us are things that move - we can see cars driving, we can

• see people walking, we can see things moving around on TV - and if you look for

• a really long time, you might even see plants growing... very slowly of course! But

• what gives these things their ability to move? Well, the answer is energy! Energy is

• the power to move, the power to do work. Energy makes things happen all around us.

• Energy isn't something that we can see or hold or touch - it's sort of like the

• wind. You can't see the wind or hold the wind - but you can see the effects of the

• wind as it blows things around. Energy is the same - you can't see the energy but

• you can see energy moving things. You can see energy at work. There's two types of

• energy that you might notice around you - one type is moving energy - also called

• kinetic energy. Imagine you ride your bicycle up a hill -

• it takes a lot of energy to move your bike up the hill, and because the bike is

• moving - you're using kinetic energy. The bigger and heavier the bicycle, the

• harder you have to push and the more kinetic energy you need to make the

• bicycle move! The second type of energy is called stored energy, or potential

• energy. This is when something isn't moving right now, but it could move. It has the

• potential to move - which is why we call it potential energy. So, for example, if

• you're on your bike and you're at the top of the hill, you have to keep your

• brakes on, otherwise you'll roll down the hill. The bike has potential energy - or

• stored energy - energy stored in the bicycle, waiting to be used. As soon as

• you take the brakes off you begin to roll down the hill, and because now you

• and the bike are moving - that's called kinetic energy again. So energy is the

• ability to move against a force - whether you're actually moving right now or if

• you're holding on to that energy to move later. Now, I've talked about the two

• kinds of energy - kinetic energy and potential energy - let's talk about where

• energy comes from. Imagine you're riding your bike up the hill again. When you

• ride your bike your body is using energy that came from food. Humans get all their

• energy from food. Energy that's from food is called chemical energy because it

• comes from the chemicals in the food - that's why sometimes if you haven't

• eaten for a while you might get hungry or even hangry - and feel tired. It's a

• sign that your body is running out of chemical energy and it needs more, so it

• has the energy to do more exercise. But where does the food get its energy from?

• Here's a food you might know... a potato. This potato was once part of a potato

• plant - and plants get their energy from the Sun - in the form of light energy. So

• that's where plants and humans get their energy from... but what about your computer

• or your TV - where do they get their energy from? Well, computers and TVs and

• other appliances in your house get their energy from electrical energy. You might

• call it electricity. Electricity comes from power plants that make electrical

• energy by burning oil or coal, and they send the electricity to our home along

• wires. Some homes get their electricity from solar panels. Solar panels turn the

• light energy from the Sun into electrical energy that you can use in

• your home. So in this video we learned about the two kinds of energy: kinetic or

• moving energy, and potential or stored energy - and we also learned about the

• places where energy comes from. Whether your energy comes from food or from

• light or from electricity - all types of energy just mean the ability or the

• potential to move.

Hi everyone! I'm Jayde and today we're going to talk about energy! But what is

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# エネルギーとは何か？ (What is Energy?)

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薛明璟 に公開 2021 年 01 月 14 日