How does horsepower relate to rpm

The distance it is from the axis is important, as well as the angle it is applied at. For example, a wrench is most effective when the hand holding it is perpendicular to it. If the hand is held at a greater or lesser angle on the wrench, there is less force being applied and so it is harder to rotate an object, such as a bolt. Study the formula to convert horsepower between RPM. Work is equal to the torque multiplied by the time. The equation is therefore:. The constant is a result of converting RPM to radians per second, and of using the definition of horsepower.

Practice using the equation converting torque and RPM to horsepower. Do this by converting a given torque and RPM to that of horsepower.

The horsepower delivered from the engine so that the shaft can power the wheels is:. Use the formula to convert a given horsepower and known torque to RPM. If the car engine delivers 72 hp to its wheels, and the RPM is , then the torque used is:.

It is the force that rockets a sports car from in seconds and pushes you back in the seat. It is also what powers big trucks hauling heavy loads into motion. These are the basics of horsepower and torque, but how are these concepts measured and how are they interrelated? Mathematically speaking, horsepower is the force needed to move pounds one foot in a second, or 33, pounds one foot in a minute.

Horsepower is found by measuring torque because torque is easier to calculate. Torque, as previously mentioned, is the expression of a twisting force and is measured in units of force times distance from the axis of rotation. So for instance, if you use a 1-foot-long wrench to exert a force of 10 pounds on the end of a bolt, then you are applying a torque of 10 pound-feet 10 lb-ft.

For the third year in a row, a RAM truck has won the award for MotorTrend Truck of the Year, letting the world know—as well as its competition—that they know a thing or 2 when it comes to game-changing performance from a truck. Find out more. For instance, the greater the horsepower an engine produces, the higher the torque potential.

This explains why a race car and a tractor that have the same amount of horsepower can vary so drastically. We are dealing with engines where the force and power are delivered in rotary motion.

This changes things a little. Torque is the force applied through or derived through a lever or torque arm that will rotate about a fulcrum or pivot. For our purposes, the arm is a radius. If a 10 lb. We will use a brake and a torque arm when measuring the torque of an engine.