Power is the rate of work done. Power is measured in joules per second (Js-1) or watts (W). The rate of work done against gravity by a 70kg man climbing a 3.0m flight of stairs in 8.0 seconds is given byPower = (mgΔh)/t= (70 × 9.81 × 3.0)/8.0= 258 W
Read the text
Read the text and highlight anything you think is important. When you go on, the text is hidden and you answer from memory.
Specification: OCR Physics A (H156), AS-level, 3.3.3 Power. Topic: Work, Energy and Power.
Key terms in this lesson
- plastic deformation
- A change of shape from which an object does not return to its original shape once the deforming force is removed.
- Hooke's law
- The extension of a spring or wire is directly proportional to the force applied, provided the limit of proportionality is not exceeded.
More in Work, Energy and Power
- Work Done at and Angle to Motion
- Principle of Conservation of Energy
- Forms of Energy
- Kinetic Energy
- Gravitational Potential Energy
- Energy Transfer
- Power and Motion
- Efficiency
All 10 lessons in Work, Energy and Power · All OCR AS-level Physics topics