Unit 3 · 3.5 — Power

Everything to learn here

• Concept: Power defines the time rate at which work is done or energy is transferred between systems.
• Concept: A powerful engine does not necessarily do more total work, but it does the same amount of work in a shorter time interval.
• Equation: $$P=W/\Delta t=\Delta E/\Delta t\text{(Average Power)}$$
• Equation: $$P=Fv\cos (\theta )\text{(Instantaneous Power delivered by a constant force to an object moving at velocity v)}$$
• Vocabulary: Power — The rate of energy transfer, measured in Watts (Joules per second).
• Vocabulary: Watt (W) — The SI derived unit of power, equivalent to one Joule per second (J/s).
• Skill: Mathematical Routines — Computing the instantaneous power output of a motor (e.g., an elevator or a block on an incline) moving at a constant velocity using fundamental derivations and correct SI units.
• Vocabulary: Vocabulary: Power — The rate at which energy is transferred into a system or converted between different forms over time.

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