What is the relationship between power and torque?
2 Answers
If the rotational speed is constant, the greater the power, the greater the torque. The following is an introduction to power and torque: 1. Power: It refers to the amount of energy output in one second, or the force multiplied by the distance acted upon in the direction of the force. 2. Torque: Torque refers to the average moment output from the crankshaft during engine operation and is an important parameter of engine performance. Torque affects acceleration, while power affects speed. Additional information: Under constant power conditions, torque is inversely proportional to engine speed. The faster the speed, the smaller the torque, and vice versa. The greater the torque, the more force the engine outputs, the faster the crankshaft speed changes, and the better the car's climbing ability and acceleration.
With years of experience in the automotive field, I'm very familiar with the relationship between power and torque. Power refers to the work done per unit of time, such as horsepower indicating how fast a car can go; torque is a measure of rotational force, measured in Newton-meters, determining the explosive force during acceleration and hill climbing. The core relationship is that power equals torque multiplied by speed divided by a constant (approximately 9550). Simply put, high torque provides strong acceleration at low speeds, like diesel trucks easily hauling heavy loads; high power supports sustained high speeds at high RPMs, such as sports cars overtaking at high speeds. In actual driving, engine design must balance this relationship—high RPM power may consume more fuel, while strong low-end torque offers efficiency. Optimizing transmission gear ratios can match different speed ranges, ensuring smooth performance in various scenarios. In urban traffic, high-torque engines offer responsive starts; on highways, high-power engines deliver faster acceleration and better fuel efficiency.
