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Horsepower (hp) is a unit of power originally defined by James Watt to compare steam engine output to horse work. One mechanical horsepower = 745.7 watts. Metric horsepower (CV/PS) = 735.5 watts.
Công thức
1 HP = 745.7 W | HP = Torque(lb-ft) × RPM / 5252
- HP
- Horsepower (hp)
- τ
- Torque (lb-ft)
- RPM
- Revolutions Per Minute (rev/min)
Hướng dẫn từng bước
- 11 HP (mechanical) = 745.7 W
- 21 CV/PS (metric) = 735.5 W
- 3Power (W) = Torque (N·m) × Angular velocity (rad/s)
- 4kW = HP × 0.7457; HP = kW × 1.341
Ví dụ có lời giải
đầu vào
200 HP engine
Kết quả
149.1 kW or 202.8 CV (metric horsepower)
đầu vào
100 kW electric motor
Kết quả
134.1 HP or 135.9 PS
Câu hỏi thường gặp
Why is it called "horsepower"?
James Watt coined the term by measuring how much work a horse could do. One horse could lift 550 pounds 1 foot in 1 second — that became the standard.
Is horsepower the same as torque?
No. Torque is rotational force. Horsepower is the rate at which work is done. A given torque at higher RPM produces more horsepower.
Why do cars list both torque and horsepower?
Torque determines acceleration at a given RPM. Horsepower determines top speed. Both matter for understanding engine performance.
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