MODULE V
Electrical engineering - Basics Page 21

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3.4 Exercises

  1. A measurement of an electric drinking water heater resulted in an amperage of 17,5A. The mains voltage is 230V. Determine the power of the drinking water heater.

  2. An immersion heater has a power output of 1000W if the voltage is 230V. Determine the amperage and the electrical resistance.

  3. A 400V three-phase motor has a current consumption (amperage) of 9,15A, the efficiency ratio is = 0,82 and the power factor is = 77%. Determine the rated power output of this motor.

  4. An immersion heater with a power of 800W was used for 10 minutes to heat water. Determine its energy consumption.

  5. A heating pump motor consumes a power of 80W. During the heating season the pump is in use for 240 days.

  6. In a heating system the following electrical components are installed:
    - two circulation pumps with 120W power each,
    - two circulation pumps with 180W power each,
    - two oil burners with an electric power of 500W each.
    During the heating season the pumps are used for 235 days. The operating hours counters of the burners show an operating time of 1500 hours for each burner. Determine the total electric energy need [kWh] for the heating period.


 

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