A resistor, an inductor, and a capacitor are in parallel across a sine wave ac source. The resistor carries 7 mA, the inductor, 3 mA, and the capacitor, 11 mA. Total circuit current (IT) is
A) 10.6 mA B) 7 mA C) 1 mA D) 14 mA
A
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Which of the following statements accurately represents sugar gliders?
a. Sugar gliders are solitary animals. b. Their behavior in captivity mirrors behaviors observed by field researchers. c. The sugar glider is considered to be a domesticated species. d. A solitary sugar glider will self-mutilate.
The circuit shown in Figure P4.75 is a Wheatstone bridge, which can be used to determine the reactance X4 of an inductor or capacitor. R1 and R2 are adjusted until vab is zero.
a. Assume a balanced bridge (vab = 0) and determine X4 in terms of the other circuit elements.
b. Assume a balanced bridge and let C3 = 4.7?F, L3 = 0.098 H, R1 = 100?, R2 = 1?, and
vS (t) = 24 sin(2,000t). What is the reactance of the unknown circuit element? Is it a capacitor or an inductor? What is its value?
c. What frequency should be avoided by the source in this circuit, and why?
Synchronous motors are often made to have a leading power factor by ____________________ of the rotor current.
Fill in the blank(s) with the appropriate word(s).