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82.
A 100. watt motor uses how much electrical energy when connected to a 240. volt outlet for 30.0 minutes?
A.
180. kJ
Work 1 joule
P = ---------- 1 watt = ------------ Not dependent on the voltage
time second
Work = electrical energy = Pt = 100. J s
-1
x 1800. s = 180. kJ
The Correct Answer is A.
B.
750. kJ
C.
800. kJ
D.
4320 kJ
