Calculate the Cost of Electricity Consumption

Report 1 / 5

Which of the following is the best explanation for the meaning of energy efficiency?

Difficulty Level: Medium

Report 2 / 5

Which of the following lighting device has the highest energy efficiency?

Difficulty Level: Hard

Report 3 / 5

The diagram shows an iron.

This iron has a 10.2 A current and 240 V voltage.

Calculate its electric power, W.

Difficulty Level: Medium

Report 4 / 5

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.

Difficulty Level: Medium

Report 5 / 5

Which of the following statement are correct?


I.		An ordinary house is cheaper than the green home.

II.		A green home is cheaper than the ordinary house.

III.		A green home can save money in the long term

IV.		An ordinary house can save money in the long term.

Difficulty Level: Medium