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Electrical and Computer Engineering, Electric Circuits
Year 3
Capacitor
A capacitor is used in the electronic flash unit of a camera. A small battery with a constant voltage of 6 V is used to charge the capacitor with a constant current of 10 microamperes. How long does it take to charge the capacitor when C = 10 microfarads? My Answer:
V=6V
i=10mA
C=10microF
Wc=1/2CV^2*(t)
Wc=1/2(10^-5)6^2*(t)
Wc=18*10^-5*(t)
Wc=6V*.01A=.06J
Wc=.06J=18*10^-5*(t)
t=.06/(18*10^-5)=333.33
Final answer: 333.33 s
By OTA: Kishore V.C., PhD (IP)
OTA Rating: 4.8/5
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Determine the mesh current ia and mesh current ib in the circuit shown (see attached pdf file). Show how you arrived at your answer. - Determine the mesh current ia and mesh current ib in the circuit shown (see attached pdf file). Show how you arrived at your answer.
A walker's cassette tape player uses 4 AA batteries in series to provide 6V to the player circuit. The four alkaline battery cells store a total of 200 watts-second of energy. - A walker's cassette tape player uses 4 AA batteries in series to provide 6V to the player circuit. The four alkaline battery cells store a total of 200 watts-second of energy. The cassette player is drawing a constant 10...
Angles - Check Work - Determine a when (6angle(120deg))*(-4 + j3 + 2*exp(j *15) ) = a + jb.
Note: angles are in degrees.
My Answer:
6(angle)120deg*(-4+j3+2e^j15)=a+jb
2e^j15=2*(cos15deg+jsin15deg)
6(angle)120deg*(-4+j3+1.93+j.5176)
6*(-2.07+j3.52)=
12.42+j21.12
Final answer: a=(-12.42)
Determine b
My Answer:
B=21.12
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A resistor, R, was connected to a circuit box as shown. The voltage, v, was measured. The resistor was changed, and the voltage was measured again. The results are shown in the table. Determine the Thevenin equivalent voltage vt of the circuit within the box.
My Answer:
Rc=Vt/it
I=6V/(R+2KOhm)=2V/(R+4KOhm)
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This was actually a problem posted by one ...
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