Question
a 4.5kw electric motor is 90% efficient.how much energy it use in 20 seconds.
Answers
ajay
12 minutes
ajay
13 minutes
Elena
E=Pt/η=4500•20/0.9=100000 J =0.1 MJ
Dump of Death
100KJ
usman
90kj
MaxYeng
4.5kW = 90%
5.0kW = 100%
W= 5000W x 20
= 100000J @ 100kJ
5.0kW = 100%
W= 5000W x 20
= 100000J @ 100kJ