Power is not just strength; it is the speed of energy transfer
In short: Understanding power in physics requires distinguishing between the total amount of energy used and the speed at which it is deployed. This video breaks down the essential equations and units needed for 2027/28 GCSE exams.
The video clarifies two fundamental definitions of power: the rate at which energy is transferred and the rate at which work is done. To distinguish these, it uses practical examples like charging a phone (energy transfer) versus pushing a car (work done).
Students will learn to navigate the core equations: P = E / t and P = W / t. The lesson covers standard units—Watts (W) for power, Joules (J) for energy and work, and seconds (s) for time—while providing worked examples on comparing lamp power and rearranging formulas to find energy transferred by appliances like microwaves.
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Sources
- Summary by Intellect · source: GCSE Physics - Power & Work Done - Equations | Calculations (2027/28 exams)
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