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  2. Relation Between Engine HP & KW Output - Physics Forums

    www.physicsforums.com/threads/relation-between-engine-hp-kw-output.519830

    The relationship between engine horsepower (HP) and kilowatt (kW) output is directly dependent on the efficiency of the engine. In general, one horsepower is equivalent to 0.746 kilowatts. This means that for every 1 horsepower of engine output, approximately 0.746 kilowatts of energy can be generated.

  3. Calculating PSI to KW Conversion | Dale's Questions - Physics...

    www.physicsforums.com/threads/calculating-psi-to-kw-conversion-dales-questions...

    To convert PSI (pounds per square inch) to KW (kilowatts), you can use the following formula: KW = (PSI x GPM) / 1714. GPM stands for gallons per minute. This formula is based on the fact that 1 PSI is equal to 0.00694 pounds per square inch, and 1 KW is equal to 0.001341 horsepower. 2.

  4. How much power does my car actually need to maintain speed?

    www.physicsforums.com/threads/how-much-power-does-my-car-actually-need-to...

    When traveling on level roads at constant speed, most passenger cars need only about 20 hp or so to overcome rolling friction and air drag. (More power would be needed, obviously, if you were carrying a door on top of your car, with the flat side perpendicular to the line of travel. The power required to overcome rolling friction is pretty ...

  5. Horsepower to kilowatt-hours? - Physics Forums

    www.physicsforums.com/threads/horsepower-to-kilowatt-hours.217086

    In the English system of units, power is expressed as horsepower (hp) instead of watts, where 1 hp=746 W. Horsepower is often used for motors and automobiles. How many kilowatt-hours of energy is produced when you run a 23.0 hp motor for 240 minutes? Homework Equations 1 hp=746 W 1000 W=1 kW 60 min = 1 hr 60 s = 1 min 1 W = 1 J/s The Attempt at ...

  6. Calculate the power of a the lift motor - Physics Forums

    www.physicsforums.com/threads/calculate-the-power-of-a-the-lift-motor.500330

    1,118. 0. To calculate the power of the lift motor, we need to use the formula P = W/t, where P is power, W is the work done, and t is the time taken. In this scenario, the work done is the force required to lift the bricks (400kg) multiplied by the distance (50m). This gives us a total work of 20,000 joules (400kg x 50m).

  7. Does an Alternator Really Take This Much Torque? - Physics Forums

    www.physicsforums.com/threads/does-an-alternator-really-take-this-much-torque...

    Datasheet Graph shows torque peak ~ 13.6 ft lbs at maybe 2750 RPM which calculates 7.12 hp, just about what the dotted hp line on same graph shows . and at output of 14.5 volts and 150 amps, which is 2175 watts, which is 2.91 hp, that's 41% efficiency. 41% seems a bit low if typical is 50 to 60:.

  8. Calculating Automobile Crankshaft Torque for Beginners - Physics...

    www.physicsforums.com/threads/calculating-automobile-crankshaft-torque-for...

    To calculate the torque delivered by the crankshaft, you will need to use the formula: Torque (N·m) = Power (W) ÷ Angular velocity (rad/s). In this case, the power is given as 100hp (=74.6kW) and the angular velocity is 1800 rev./min, which can be converted to 188.5 rad/s. Plugging these values into the formula, we get:

  9. Maximizing Power and Efficiency: Flywheel Torque vs. Horsepower

    www.physicsforums.com/threads/maximizing-power-and-efficiency-flywheel-torque...

    The torque and horsepower of a 100kg flywheel play a crucial role in its performance. A higher torque or horsepower means the flywheel can rotate faster and with more force, resulting in a more powerful and efficient performance. On the other hand, a lower torque or horsepower may result in slower rotation and less power output.

  10. Power/Torque Relations: Exploring the Imperial vs. Metric...

    www.physicsforums.com/threads/power-torque-relations-exploring-the-imperial-vs...

    When I try to plot the imperial version, I get the typical graph with HP and torque intersecting at 5252rpm. But when I try to plot the same torque values in metric using Power (kW) = Torque (Nm) * rpm * 2*PI/60, I get something wayy different with the power and torque curves not even intersecting. You're forgetting the factor of 1000 by the ...

  11. Why such a large engine/generator in a Chevy Volt? - Physics...

    www.physicsforums.com/threads/why-such-a-large-engine-generator-in-a-chevy...

    The Chevy Volt has a large engine/generator because it is a plug-in hybrid electric vehicle (PHEV). This means that in addition to using electricity from its battery, it also has a gasoline engine that can generate electricity to power the car when the battery is low. The size of the engine/generator is necessary to provide enough power to ...