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Wattmeter and Watt-Hours

Wattmeter and Watt-Hours. Wattmeter. Wattmeter measures the instantaneous power. Watt-hour meter measures the amount of power used in a given time. Kilowatt-hours (kWh) – because watt-hour is very small, utility meters read in kilowatts Number of

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Wattmeter and Watt-Hours

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  1. Wattmeter and Watt-Hours

  2. Wattmeter • Wattmeter measures the instantaneous power. • Watt-hour meter measures the amount of power used in a given time. • Kilowatt-hours (kWh) – because watt-hour is very small, utility meters read in kilowatts • Number of • Electric power consumed is purchased at current rates per kWh.

  3. Efficiency • Efficiency is a ratio of electrical power. • % efficiency =

  4. EER • Federal government tests products to ensure that the energy efficiency rating, EER, is correct. • Higher percentage, more efficient the unit, the cheaper to operate.

  5. Gears, Pulleys, and Power • By using gears and pulleys in an electromechanical system, we can manipulate such facts as torque, work and rpm while maintaining the same horsepower.

  6. Conservation of Energy • The law of conservation of energy states that energy can neither be created nor destroyed. Energy can only be converted from one form to another.

  7. Gear Reducers • To avoid the safety problems associated with pulleys and chains, many applications use gear reducers to obtain great twisting forces. The gear reducers lower the rpm of the motor which in turn increases the twisting forces of the gear reducer shaft.

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