4. Work, Power, and Energy
Work, power, and energy are essential concepts in electricity, explaining how forces do work, how energy is transferred, and how power quantifies this process over time. The formulas for calculating these quantities are central to electrical systems. Understanding their relationships aids in analyzing circuits and optimizing energy efficiency.
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What we have learnt
- Work is done when a force moves an object in its direction.
- Power is the rate at which work is done, measured in Watts.
- Energy is the capacity to do work, measured in Joules.
Key Concepts
- -- Work
- The energy transfer when a force moves an object over a distance, mathematically defined as W=F⋅d.
- -- Power
- The rate at which work is done or energy is transferred, calculated as P=W/t.
- -- Energy
- The ability to do work, calculated as E=P⋅t, and expressed in Joules.
- -- Electrical Power
- The rate at which electrical energy is consumed or transformed, expressed as P=V⋅I.
- -- Energy Efficiency
- The goal of using less energy to provide the same service.
- -- Law of Conservation of Energy
- Energy cannot be created or destroyed; it can only be transformed from one form to another.
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