Comments by "Sebastian Nolte" (@sebastiannolte1201) on "driving 4 answers" channel.

  1. Nice video, but I have to be nitpicky here: Although you explain that "Horsepower" is the unit for "Power" you still mix it up several times. Also in the title. Let's better be correct here ;-) So it has to be "POWER vs TORQUE" or "HORSEPOWER vs POUNDFEET" However, all that shows why metrics (or let's better say: SI-units) are just better. In Germany people still use "Horsepower" ("Pferdestärke"= "PS") when it comes to cars because they are used to it - although SI-Unit are mandatory. So car companies use both on there websites or brochures: PS and kW (kiloWatt). Using (Kilo)Watts makes much more sense than horsepower, because you already see the connection between "Energy" and "Power" (that you describe in the video) already when you just look at the units. When we have an electric car with a battery that can storage 50 kWh of energy and motor that can produce a power 100kW, then we know (let's ignore efficency here) that after driving half an hour on full throttle the battery will be empty. Try that when you only know, how much horsepower you car has! And already the unit kWh shows that energy is the product of Power (in kW) and time (in h). Or the otherway around: When you charge you car at at charging station with 50 kW, it will take one hour to fully charge a 50kWh battery. Another energy unit is calories. One calory is the amount of energy that is needed to heat one 1g of water by 1 °C. LOL, nonsense! So instead we should use Joule (J), that is also printed on food. And no, Joule is NOT just another random unit, instead one Joule is one Wattsecond (1 J = 1 Ws). Now that makes sense! You see also here, that "energy" is "power x time". You even can compare the amount of energy that is storaged in the battery of an electric care with the energy that is storaged in a candy bar :-)
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