Sign In or Create an Account.

By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy

Podcast

Shift Key Summer School: What Is a Watt?

Jesse teaches Rob the basics of energy, power, and what it all has to do with the grid.

Power lines.
Heatmap Illustration/Getty Images

What is the difference between energy and power? How does the power grid work? And what’s the difference between a megawatt and a megawatt-hour?

On this week’s episode, we answer those questions and many, many more. This is the start of a new series: Shift Key Summer School. It’s a series of introductory “lecture conversations” meant to cover the basics of energy and the power grid for listeners of every experience level and background. In less than an hour, we try to get you up to speed on how to think about energy, power, horsepower, volts, amps, and what uses (approximately) 1 watt-hour, 1 kilowatt-hour, 1 megawatt-hour, and 1 gigawatt-hour.

Shift Key is hosted by Jesse Jenkins, a professor of energy systems engineering at Princeton University, and Robinson Meyer, Heatmap’s executive editor.

Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, YouTube, or wherever you get your podcasts.

You can also add the show’s RSS feed to your podcast app to follow us directly.

Here is an excerpt from our conversation:

Jesse Jenkins: Let’s start with the joule. The joule is the SI unit for both work and energy. And the basic definition of energy is the ability to do work — not work in a job, but like work in the physics sense, meaning we are moving or displacing an object around. So a joule is defined as 1 newton-meter, among other things. It has an electrical equivalent, too. A newton is a unit of force, and force is accelerating a mass, from basic physics, over some distance in this case. So 1 meter of distance.

So we can break that down further, right? And we can describe the newton as 1 kilogram accelerated at 1 meter per second, squared. And then the work part is over a distance of one meter. So that kind of gives us a sense of something you feel. A kilogram, right, that’s 2.2 pounds. I don’t know, it’s like … I’m trying to think of something in my life that weighs a kilogram. Rob, can you think of something? A couple pounds of food, I guess. A liter of water weighs a kilogram by definition, as well. So if you’ve got like a liter bottle of soda, there’s your kilogram.

Then I want to move it over a meter. So I have a distance I’m displacing it. And then the question is, how fast do I want to do that? How quickly do I want to accelerate that movement? And that’s the acceleration part. And so from there, you kind of get a physical sense of this. If something requires more energy, if I’m moving more mass around, or if I’m moving that mass over a longer distance — 1 meter versus 100 meters versus a kilometer, right? — or if I want to accelerate that mass faster over that distance, so zero to 60 in three seconds versus zero to 60 in 10 seconds in your car, that’s going to take more energy.

Robinson Meyer: I am looking up what weighs … Oh, here we go: A 13-inch MacBook Air weighs about, a little more than a kilogram.

Jenkins: So your laptop. If you want to throw your laptop over a meter, accelerating at a pace of 1 meter per second, squared …

Meyer: That’s about a joule.

Jenkins: … that’s about a joule.

Mentioned:

Decarbonize Your Life

This episode of Shift Key is sponsored by …

The Yale Center for Business and the Environment’s online clean energy programs equip you with tangible skills and powerful networks—and you can continue working while learning. In just five hours a week, propel your career and make a difference.

Music for Shift Key is by Adam Kromelow.

Green

You’re out of free articles.

Subscribe today to experience Heatmap’s expert analysis 
of climate change, clean energy, and sustainability.
To continue reading
Create a free account or sign in to unlock more free articles.
or
Please enter an email address
By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy
Energy

A Wildfire Is Coming for Electricity Bills

Forget data centers. Fire is going to make electricity much more expensive in the western United States.

A graph and fire.
Heatmap Illustration/Getty Images

A tsunami is coming for electricity rates in the western United States — and it’s not data centers.

Across the western U.S., states have begun to approve or require utilities to prepare their wildfire adaptation and insurance plans. These plans — which can require replacing equipment across thousands of miles of infrastructure — are increasingly seen as non-negotiable by regulators, investors, and utility executives in an era of rising fire risk.

Keep reading...Show less
Sparks

Trump Uses ‘National Security’ to Freeze Offshore Wind Work

The administration has already lost once in court wielding the same argument against Revolution Wind.

Donald Trump on a wind turbine.
Heatmap Illustration/Getty Images

The Trump administration says it has halted all construction on offshore wind projects, citing “national security concerns.”

Interior Secretary Doug Burgum announced the move Monday morning on X: “Due to national security concerns identified by @DeptofWar, @Interior is PAUSING leases for 5 expensive, unreliable, heavily subsidized offshore wind farms!”

Keep reading...Show less
Blue
AM Briefing

The Big Atom

On Redwood Materials’ milestone, states welcome geothermal, and Indian nuclear

Kathy Hochul.
Heatmap Illustration/Getty Images

Current conditions: Powerful winds of up to 50 miles per hour are putting the Front Range states from Wyoming to Colorado at high risk of wildfire • Temperatures are set to feel like 101 degrees Fahrenheit in Santa Fe in northern Argentina • Benin is bracing for flood flooding as thunderstorms deluge the West African nation.


THE TOP FIVE

1. New York partners with Ontario on advanced nuclear

New York Governor Kathy Hochul. John Lamparski/Getty Images for Concordia Annual Summit

Keep reading...Show less
Green