NEVER be confused by HORSEPOWER and TORQUE again - HP and TORQUE EXPLAINED in the MOST VISUAL WAY
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2021-05-02に共有
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In today's video I'll be using Legos to give you the most visual explanation and demonstration of horsepower and torque. If you have ever been confused by horsepower and torque I guarantee that after watching this video these two concepts will never confuse you again.
So let's get started, and we're starting with Torque. Now this LARGE Lego motor outputs 0.14 Nm and this smaller LEGO motor outputs 0.03 Newton meters. What's a newton meter? Well a newton meter is a MEASURE of torque. It measures HOW MUCH torque is being generated.
What is torque? The simplest explanation of torque is that it's a ROTATIONAL FORCE. It's the ROTATIONAL equivalent of LINEAR FORCE.
When you take this bolt and push it you're applying linear force to it. But when you decide to bolt it down you're applying torque to it. In both cases a certain amount of force is present but what's different is the direction of that force.
So our LEGO motors are outputting a certain amount of torque that we have expressed in Newton Meters.
1 newton meter of torque simply equals the force of 1 Newton applied at the end of an arm that is one meter long. So for example if we take this bolt and use this wrench which is one meter long and apply a force of 1 newton at it's end the resulting torque present at the bolt will be ONE NEWTON-METER. Newton meters confuse you? No problem, because torque can also easily be expressed in foot pounds.
1 foot pound of torque is equal to the force of 1 pound being applied at the end of an arm that is 1 foot long.
So in this scenario I'm using the stored energy in my muscles to generate torque at the bolt. Our Lego motors are doing the same thing, they're using the electrical energy stored in these batteries to generate torque or rotational force, and as we have seen our large Lego motor is outputting more torque than our small motor. This difference in torque can EASILY BE FELT. If we install a small shaft into our motor we can feel the difference in rotational force coming from these motors. The difference in torque output is very obvious and the large motor feels much stronger and it's very difficult to stop it.
Just like our LEGO motors THE MOTORS in modern electric cars use the stored energy in their battery packs to generate torque. On the other hand internal combustion engines rely on the energy stored in fossil fuels to generate torque.
The key word in the word horsepower is POWER. What is power? Power is the rate at which work is done, in more simple terms power measures how often a certain force is applied over a given period of time. You could even call power = activity. It measures how many times you can repeat the same action over a given period of time.
This means that torque is influenced by only one factor – the amount of rotational force
But horsepower is influenced by two factors – the amount of force and how many times that force can be exerted over a given period of time.
Now we're going to attach these blocks onto the shafts of our Lego motors so that we can more easily observe how fast each of them rotates.
As you can see the small motor actually rotates faster that the large motor. In fact over the period of one minute the small motor makes 275 rotations while the large motor makes only 146 rotations. This means that although it can't generate as much torque as the large motor, the small motor applies it's torque at a greater rate over the same period of time.
This means that while torque can be both felt and observed horsepower cannot be felt in the same sense. If we put our fingers against the shaft we're feeling the torque, we're feeling the force against our fingers. When we're sitting inside a car and the car accelerates we're again feeling the force pushing us against the seat. We can only feel the amount of force, and because torque is only a force we can feel it. But horsepower isn't only a force, it's a measure of the rate of force. In the case of engines and motors it is the amount of rotational force or torque multiplied by rotations per minute or rpm.
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コメント (21)
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How to increase torque with gears: https://youtu.be/txQs3x-UN34
Motivation: www.youtube.com/channel/UCt3YSIPcvJsYbwGCDLNiIKA
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"Newton meters confuse you?"
Me: yes
"It can be also explained in foot pounds"
Me: dafaq -
As a Mechanical Engineer, I cannot believe you just explained the conceptual difference between Torque and HorsePower better than EVERY SINGLE professor I've ever had!
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One important additional difference to note is, that TORQUE CAN BE CHANGED by a GEARBOX - you can trade rotational speed for torque or vice-versa. But power is conserved - no gearbox can make power out of nothing. This is essential, and why we have transmission in the first place. You could pull a truck with a Nissan engine, you would just need a low range gearbox.
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This reminds me of those great scientific industrial films from the 1950s, one in particular explains how differential steering works in a car with models, demonstrations, and illustrations.
Also the MST3k shorts with industrial films are a pretty good watch too! -
Okay, you weren't kidding, this is actually a really good explanation. You really didn't mess around with any other fluff, you got to the point and explained it with brilliant visual demonstrations. Well done.
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4:13 D4A “The key word in the word horsepower is...”
Me, an intellectual “Horse!”
D4A “Power!”
Me “...” -
I always like to think of it applied to a gym workout. Torque is how much your max bench press is. Horsepower is how much weight you lifted over a time period( say, 1,000 kg in 60 seconds).
Someone benching 100kg 10 times in 60 seconds is the same Horsepower as someone benching 200kg 5 times in 60 seconds. The second guy has twice the torque, but half the speed. Same horsepower. -
Easily comprehendible, honestly horsepower was one of the concepts that I couldn't wrap my head around. Now am familiar with it I'll have to think about it more but at least I'll know how to think about. Thank you for the video
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I love how this video gets straight to the point. Doesn't have a long intro or some history lesson to artificially make the video longer. It's perfect.
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"Newton meters confuse you?"
Me: "No, it is pretty self-explanatory"
"It can be also explained in foot pounds"
Me: "Well now they do" -
GREAT explanatory video!
Part of the additional torque of a diesel engine is due to the greater radius of the crank where the large end of connecting rod is exerting force. It's like accelerating a bicycle with longer pedal arms. You will generate more torque at the center axis of the crank using the same "pushing" force against the pedal while using a longer pedal arm (or pedal crank). A greater crank radius will require longer connecting rods because the distance travelled transversely at the big end is greater and you don't want too great an angle between the connecting rod where it meets the bottom of the piston. A larger diameter crank increases the compression ratio which is higher in a diesel engine (usually 14:1 to 25:1) than in a gasoline engine (8:1 to 12:1).
There's plenty more information out there about how diesels differ from gasoline engines. -
I think it might be helpful to think about the electrical analogue of Torque and RPM as Voltage and Current, respectively. In both cases the product of the two results in Power. Voltage and Torque are what you need to overcome electrical resistance or mechanical friction, while current and RPM are the time dependent concepts that help you deliver high Power once you overcame the initial barrier. Maybe the analogy would be more accurate when you think about increasing voltage in order to create a dielectric breakdown to get the current flowing. I think this is very similar to using torque to make the wheels start spinning when you have a heavy load or are in a very inclined slope.
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Would be interesting long stroke versus short stroke, and how power is generated differently. Effect on moving mass, compression, RPM...
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Love the use of Eddie Hall representing the truck😂
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This is by far the best explanation of the topic i found so far. Excellent. Thank you.
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Thanks for the DEFINITIVE video on this difference. Absolute gem!
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"Newton meters confuse you?"
"It can be also explained in footballfield cowfarts" -
"May the torque be with you"
-Luke Skyrunner -
Excellent !! Your explanation was superlative !!! My doubts were cleared ..
