Calculating the power developed by an engine

Section 1: Understanding Power

Get familiar with the concept of power in physics. It is the rate at which work is done or energy is transferred.
Know the unit for power in the International System of Units (SI), which is Watt (W).

Section 2: Mathematical Representation of Power

Power can be mathematically represented by the formula P = W/t, where ‘P’ stands for power, ‘W’ for work done and ‘t’ for time taken.
Understand that the work done (W) is the product of the force applied (F) and the distance moved (d) in the direction of the force, i.e., W = F * d.
Since power is the rate of doing work, it can also be represented as P = F * d/t. In mechanics, distance divided by time (d/t) is velocity; therefore the formula becomes P = F * v, where ‘v’ is the velocity.

Section 3: Power Developed by an Engine

Learn that the power developed by an engine can be calculated by measuring the force applied by the engine and the velocity of its motion.
Understand that the movement of the engine might be affected by several forces such as friction, gravity or any other external forces.
Remember that the force taken into account should ideally be the net force acting in the direction of the engine’s movement.

Section 4: Problem-solving Strategies

Use the formula P = F * v to calculate the power developed by an engine, given the force and the velocity.
When working on problems, make sure all the units of measurement are consistent. For example, if power is to be calculated in watts, force should be in newtons and velocity in metres per second.
Practice converting between unit systems when needed, and mastering this conversion method can greatly simplify problem-solving.
Further develop your understanding through regular practice problems including different scenarios of engine power calculation.