A microwave oven operates on 1500 W of power and is used for 20 minutes. How much electrical energy, in joules and kW•h, is used by the microwave oven?

Question

With steps please

23059 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-03-22T16:19:38

#"1.8 MJ"# and #"0.5 kWh"#

#"Power" = "Energy"/"Time"#

Unit of power is Watt.

#"1 W" = 1\ "J/s"#

#"E" = 1500\ "J"/cancel"s" × 20 cancel"min" × (60 cancel"s")/cancel"min" = "1800000 J" = "1.8 MJ"#

or

#"E" = "1500 W" × 20 cancel"min" × "1 h"/(60 cancel"min") = "500 Wh" = "0.5 kWh"#