Transformers – How does electricity reach our home?

How does electricity reach our homes? It all starts from the power station, which gives a voltage of 20kV. But, to transmit this voltage over longer distances, it is stepped up (440kV) with the help of Step-up transformer. The transmission lines carry this voltage (440kV) to the substations or distribution stations, where the voltage gets […]

The Industrial Revolution: Crash Course European History #24

Hi I’m John Green and this is Crash Course European History. So we’re going to turn our attention now to the Industrial Revolution, one of the most significant developments in human history. Like, imagine with me that it’s 1820. I got this idea from the economist Robert Gordon by the way. You live in, say, […]

Nuclear Physics: Crash Course Physics #45

E=mc^2 You hear it all the time. But what does it mean? During his study of special relativity, Albert Einstein found that mass and energy are equivalent, and that they can be converted back and forth between one another. He described that relationship mathematically, saying that the energy of a particle is equal to its […]

Hydrocarbon Power!: Crash Course Chemistry #40

You’ve heard this before, but it bears repeating. Carbon is the element of life. So much so that when we explore other planets the first thing we look for is compounds that contain carbon. In fact, there was a time when we thought carbon compounds could only be produced by living things. So early chemists […]

Nuclear Chemistry Part 2 – Fusion and Fission: Crash Course Chemistry #39

As I said before chemistry is, like many aspects of your own life, all about a search for stability. Last week we talked about radioactive decay and how atomic nuclei get rid of various particles in order to become more stable. But what is this illusive stability that all things seem to be striving for […]

The Engineering Challenges of Renewable Energy: Crash Course Engineering #30

Engineering has given a lot to the world. It’s transformed the nature of work, improved sanitation and helped create vital infrastructure. The bad news is that to power the tools and processes behind those developments, we’ve relied on non-renewable fuels – the kind that get produced at a much slower rate than we use them. […]

Nuclear Chemistry: Crash Course Chemistry #38

Apparently, it can turn you into a superhero or into a mutant zombie. It’s the plot device for probably half of the sci-fi movies made in the last 60 years and it’s even the name of the song that welcomes you to the new age, to the new age, welcome to the new age. Presumably […]

Seasons and the Sun: Crash Course Kids 11.1

[INTRO MUSIC] Winter, spring, summer, fall, Seasons, I just love them all. Other than inspiring me to make up goofy poetry, why wouldn’t you love the seasons? There’s always something to look forward to! You already know that summer means long days of fun in the sun, and winter means shorter days. Not to mention […]

Price Controls, Subsidies, and the Risks of Good Intentions: Crash Course Economics #20

Adriene: Welcome to Crash Course Economics. My name is Adriene Hill Jacob: And I’m Jacob Clifford, and today we’re going to talk about good intentions, and how they can go wrong. Price controls can derail markets. And subsidies can distort them. Adriene: And “deadweight” isn’t just a good description of your ex. [Theme Music] Jacob: […]

Inside Biosphere 2: The World’s Largest Earth Science Experiment

Since the dawn of humanity, we’ve had a complex relationship with nature. We’re obviously a part of it, but often we view ourselves as separate from nature or even working against it. Through the control of fire, the rise of agriculture, and the growth of our civilization, we’ve been molding the Earth’s environment to suit […]