Dell Charger Brick Power Specs

When I first took home my laptop, I noticed that it was a monster. I had bought it based on the specs, not paying much attention to its size. As it turns out, it's a a 17.5in behemoth, which I named "Levi" - short for "leviathan". In any case, with a huge computer comes a huge power supply, as can be seen below:

Charger brick on top of laptop - banana for scale

Specs

The power brick can take input between 100-200V at 3.5A AC at 50-60Hz. The output is 12.5V at 12.3A DC. That means it has an internal resistance of 1.59Ω, and power output of 240W (rounding to 3 significant figures). Since I'm an RA and still live on-campus, that means according to BGE's confusing rate schedule, the school is paying between 1.68 and 3.71 cents per hour that I have my charger plugged in. Assuming I'm lazy and leave my charger plugged in all the time, that's $6.23 per week - or a little over two and a half gallons of gas per week, given Maryland's average price of $2.369 per gallon.