This video is amazing! And ALSO a great example of the difference between energy (or work) and power… And that let’s us explore why it is so damned hard to wean ourselves from fossil fuels – as we must.
From Andrew Dressler: “Filling a 20-gallon tank in 4 min. corresponds to 2.6 GJ of energy in 240 sec. That means that, when you fill your car’s tank, you’re putting energy in at a rate of 10 MW! Given that the fastest EV chargers provide energy at a rate of ~250 kW, this means that EV’s (at best) take on power at a rate around 1/40th as fast as you put gas in your car. This might sound like an unbeatable advantage for gas, but it’s not for 2 reasons. First, cars are very inefficient — for every 5 J of energy you put in the tank, only ~1 J goes to drive the wheels. The other 4 J are ejected out the tailpipe as heat. For EVs, nearly 100% of the joules of energy you put into the battery end up driving the wheels. Thus, the real comparison is 20% of 10 MW = 2 MW vs. 250 kW. This might still seem like a big deal, but it’s not because … The second reason this is not a big deal is that (for most people): you leave your home every morning with a full battery and you recharge overnight (at around 10 kW) while you sleep. As long as you’re just driving around town, you never have to spend time refueling.”