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oscilloscope help?
1. The beam spot of an oscilloscope is the result of
A) a bottle of electrons in the scope that squirt toward the screen.
B) a laser.
C) thermionic emission of electrons from a hot cathode striking the screen.
D) gamma rays from a radioactive source in the scope.
2. An oscilloscope is set at 2 V/cm and 1 us/division for vertical and horizontal scales, respectively. What is the peak-to-peak voltage for the shown trace.
A) 2.3 V
B) 4.6 V
C) 4.0 V
D) 6.0 V
3. What is the frequency of the signal?
A) 3.0 Hz
B) 333 kHz
C) 1.5 kHz
D) 667 kHz
4. Two capacitors are connected in series with a 8.6-V battery. One capacitor has a capacitance of 100 uF and you measure the voltage across it to be 3.57 V. What is the charge on this capacitor?
5. Given your knowledge about capacitors in series, you can now find the charge on the other capacitor and therefore the capacitance of the second capacitor. What is it?
1) C
2), 3) need the figure
3) Q = V*C Q = 100*3.57 µC
4) For capacitors C1 and C2 in series with total voltage V across them, the voltage across capacitor C2 is V2 = V * C1/(C1+C2). Since you are given the voltage across C1 = 3.57V, the voltage across C2 is 8.6 - 3.57 = 5.03 V. Therefore
5.03 = 8.6*100/(100+C2) solve for C2
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