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Brake Power Formula:
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Brake Power (BP) is the actual power available at the crankshaft or output shaft of an engine. It represents the useful power delivered by the engine after accounting for all mechanical losses.
The calculator uses the brake power formula:
Where:
Explanation: The formula calculates the mechanical power output by multiplying torque and angular velocity, converting from RPM to radians per second.
Details: Brake power is essential for evaluating engine performance, determining mechanical efficiency, and designing power transmission systems. It helps in selecting appropriate engines for specific applications.
Tips: Enter rotational speed in RPM and torque in Newton-meters. Both values must be positive numbers. The calculator will compute the brake power in Watts.
Q1: What is the difference between brake power and indicated power?
A: Indicated power is the total power developed in the engine cylinders, while brake power is the actual power available at the output shaft after accounting for friction and other mechanical losses.
Q2: How is brake power measured experimentally?
A: Brake power is typically measured using a dynamometer, which applies a load to the engine and measures the torque and speed simultaneously.
Q3: What are typical brake power values for different engines?
A: Brake power varies widely depending on engine size and type. Small car engines might produce 50-150 kW, while large industrial engines can produce several megawatts.
Q4: Why is the constant 60 used in the formula?
A: The constant 60 converts rotational speed from revolutions per minute (RPM) to revolutions per second, since power is calculated per second.
Q5: Can this formula be used for electric motors?
A: Yes, this formula applies to any rotating machinery where torque and rotational speed can be measured, including electric motors, turbines, and internal combustion engines.