Final answer:
Physical energy is measured in terms of its quantity, or amount. It's related to other fundamental physical quantities like length, mass, time, and temperature, and can be understood through concepts like average speed and energy efficiency.
Step-by-step explanation:
Physical energy is measured in terms of its quantity. Energy is a physical quantity that can be calculated or measured using different tools or methods. It is most often measured in units called Joules.
In physics, there are seven fundamental physical quantities that include length, mass, time, electric current, temperature, amount of substance, and luminous intensity. For example, you can calculate the average speed, a type of energy, by dividing total distance traveled by time.
Moreover, every measurement of time involves measuring a change in some physical quantity. Hence, in the realm of physics, time is simply change, or the interval over which change occurs. Energy, power, and time are interrelated quantities applicable in various contexts from natural phenomena to human activities such as exercise.
Lastly, the efficiency of energy input is an important concept. It is the measure of the effectiveness of energy input doing work; otherwise known as useful energy or work divided by the total input of energy.
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