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241241--205205Computer Engineering Circuits Computer Engineering Circuits

Energy and PowerEnergy and Power

DK

44

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Chapter 4Chapter 4Energy and PowerEnergy and Power

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OUTLINE

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Energy and Power

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Energy and PowerEnergy (W) is the ability to do work.Power (P) is the rate at which energy is used.

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Energy and Power

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Energy and Power

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and

Energy and Power

W = Pt Joule

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The Kilowatt-hour (KWh) Units of EnergyThere is another way to express enery.Since power is expressed in watts and time, unit of energy can called watt-second (Ws), watt-hour (Wh), and kilowatt-hour (kWh).

When we use a kilowatt-hour of energy means we use one thousand watts of power for one hour.

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The Kilowatt-hour (KWh) Units of Energy

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Power in Electric Circuits

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Power in Electric Circuits

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Power in Electric Circuits

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Resistor Rating

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Resistor Rating

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Resistor Rating

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Resistor Rating

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Power Supply

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Ampere-hour Ratings of Battries

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Power Supplies Efficiency

Power Loss

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Power Supplies Efficiency

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