SCI–111 Assignment #6b Solutions
Text Problems:
Chapter Number
Questions for Thought
Group B Problems
6
5, 7, 8, 10, 11
11 to 17
Problems
11. An electric motor draws a current of 11.5 A in a 240 V circuit. What is the power of this
motor?
This is a straight forward electric power question: P=V∙I.
kW 2.763 Watts2,760A 11.5V 240 ==== IVP
The motor produces 2.763 kW of power.
12. A swimming pool requiring a 2.0 hp motor to filter and circulate the water runs for 18
hours a day. What is the monthly electric cost for running this pool pump if electricity
costs $0.10 per kWh?
This problem is one of those interesting electric cost problems. It is simply a multiplication of
(Power x Time x Cost)
( ) ( ) ( )
kWhper Cost TimePower Cost Total
=
