Day 18: Capacitors and Capacitive Circuits

  First, we did a quiz about Kirchhoff's current law and Kirchhoff's voltage law to find three voltage, three current, three power and total power.

  After the quiz, we started to learn capacitance - store charges. The unit for capacitance is F and symbol is C. We know Q(charges)=V(voltage)*C(capacitance), so we could find the equation for work is W=(1/2)V^2*C.

  Then we did an experiment. We measured the capacitance of different pages and thickness of a book, then we made graph by using Excel and find a new equation C=k(constant)/d(thickness).

  In this photo, we found area, distance and permittivity can influence capacitance because the equation C=(kE0A)/d.

  We used equation to calculate the area.

  There are the equation we found to calculate series and parallel of capacitance.

  We used the equation we found above to calculate C.

  There is an exercise, and our answer for C is 52 nF.

  There is another exercise problem professor gave us to calculate by using the equations we found.

  We found the work done by battery if capacitors are charged by using 1/2CV^2.

Conclusion:
  At beginning of the class, we did a very surprised quiz. This quiz is not that hard but need lots of time to finish it. Then we started to learn capacitance and how it works in circuit. Then we found a equation for series and parallel of capacitance. After we did some interesting exercises by using the equations we learned before.