Vast-Combination4046

Vast-Combination4046 t1_ja7vak1 wrote

Reply to ELI5: Why does farming equipment require such low horsepower compared to your average car? by thetravelingsong

Horsepower is a fictional number. It's an equation using Torque and RPM to determine horsepower. People have said "horsepower is how fast the car hits the wall torque is how far you move the wall" because torque is the actual force you apply to the work you are doing. Since it doesn't matter how fast you move your goal is the most amount of torque at a low rpm.

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Vast-Combination4046 t1_j275pg0 wrote

Reply to ELI5 why do electric vehicles have one big battery that's hard to replace once it's expired, rather than lots of smaller ones that could be swapped out based on need (to trade off range/power/weight)? by ginonofalg

They are sort of, but assembled into packs that are larger and bolted together to maximize space and reduce wiring. If you remove the seats and some covers they are relatively easy to get out most times, but they are still high voltage and can easily harm you if you aren't careful.

There is not much difference between the battery cells and the ones in drill batteries, but if you needed 100 drill batteries to use your car the packaging would take up lot of space, and then you would need more wiring because you have wiring inside the drill batteries and wiring to get the batteries from the receptacle to the rest of the vehicle.

The battery packs last long enough that making them difficult to get out isn't an issue. You can service individual cells or groups of cells, but getting an entire refurbished unit is recommended because if ones going bad you may end up fixing more not long after.

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