In an RC parallel circuit, ET = 120 V, R = 40 ?, and XC = 30 ?. What is IT?
A. 5 A
B. 6 A
C. 7 A
D. 8 A
Answer: A
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A natural resource is any form of energy that humans can use
Indicate whether the statement is true or false
Refer to Figure P2.69 and assume vS = 15 V, R1 = 12 ? , R2 = 5 ? , R3 = 8 ? , R4 = 2 ? , R5 = 4 ? , R6 = 2 ? , and R7 = 1 ? . Find:
a. The voltages vac and vbd .
b. The power delivered by the source vS .
Answer the following statement(s) true (T) or false (F)
1. Although water may appear perfectly clear and free of bubbles, it can still contain a significant quantity of air in solution. 2. Combined air and dirt separators, or a hydraulic separator with the same capabilities, are never desirable in situations where an older distribution system containing steel or iron piping or radiators will be interfaced to a new boiler. 3. Properly designed and installed hydronic systems will always require constant manual air venting. 4. Low system pressurization is usually caused by not setting the make-up water system properly. 5. Glycol-based antifreezes tend to leave a slippery film on components and tools that eventually turn sticky.
Each signal in Figure E-49 is graphed over a range of exactly one fundamental period. Which of the signals have harmonic functions 
that have a purely real value for every value of k? Which have a purely imaginary value for every value of k?
