Dr. Steven (Steve) Novella

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1,490 appearances 2 recordings 1 series first heard May 2026 last heard 27 Jun

Dr. Steven (Steve) Novella’s voice in public audio — every appearance, attributed to the second.

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The Skeptics' Guide to the Universe · The Skeptics Guide #827 - May 15 2021 podcast

than gasoline internal combustion engines, even assuming that the vehicles themselves have the same mileage efficiency. matched

Electric engines convert about twice as much of their energy into acceleration as do internal combustion engines. matched

EVs are about 50% efficient. matched

Obviously, there's some variability there, but that's a good average figure. matched

Internal combustion engines are about 25% efficient, so you get about twice the efficiency. matched

So if we say that lithium-ion batteries have a specific energy of between 100 and 265 watt-hours per kilogram, matched

Let's take the higher end of that, which like the newer batteries are using like 250 or so watt hours per kilogram. matched

Gasoline has a specific energy of 1,220 watt hours per kilogram. matched

So that sounds like a lot more. matched

But if you multiply them each by their efficiency... matched

Right. matched

So that means lithium ion batteries you have to cut in half. matched

So let's say 132 watt hours per kilogram. matched

Gasoline you have to divide by four. matched

That's 305 watt hours per kilogram. matched

So when you look at it that way, 132 versus 305, it's not that huge of a difference. matched

Right. matched

It's about twice a little bit more than twice. matched

Doesn't sound right. matched

like that big of a difference. matched

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