Energy is the ability to do work, while power is the rate at which work is done. In other words, energy is the potential to cause change, while power is the amount of energy transferred per unit of time.
Energy and work are closely related concepts. Work is defined as the force applied over a distance, while energy is the ability to do work. In order for work to be done, energy must be transferred from one form to another.
No, power cannot be negative. It is a measure of the rate at which energy is transferred, so it is always a positive value. However, this does not mean that energy cannot be negative. For example, when work is done against a force, the energy transferred is negative.
In everyday life, we often use power to describe the amount of work being done. For example, a car's engine is rated in horsepower, which is a measure of power. However, the amount of fuel consumed by the car is a measure of the energy used. This shows the close relationship between power and energy.
Yes, energy is a measurable quantity. It is typically measured in units such as joules (J) or kilowatt-hours (kWh). However, since energy can come in many forms (kinetic, potential, thermal, etc.), the specific unit of measurement may vary depending on the type of energy being measured.