Which of the following lighting device has the highest energy efficiency?
The diagram shows an iron.
This iron has a 10.2 A current and 240 V voltage.
Calculate its electric power, W.
The following is the reading of the electrical energy usage in a shopping mall in a month.
Initial reading: 75332.3 kwJ
Current reading: 77492.5 kwJ
Calculate the total energy units used.
Which of the following statement are correct?
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