PHYS222_Prelab_Quiz_11_Capacitor_Lab
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Prelab Quiz 11 Capacitor Lab
Name:
Learning goals:
Students will understand the concepts of electric potential and build simple circuits with capacitors. A capacitor stores energy as an electrical field. When an electric potential is applied across a capacitor, Positive and negative charges accumulate on each side of a capacitor until the capacitor's electric potential is equal to the applied voltage. We can describe this by a simple linear equation.
Q
=
C V
(Q: Charge collected on each side, V: electric potential applied, C: capacitance)
In this quiz, we will investigate the characteristics of a capacitor. First, we will investigate the Capacitor Lab simulation. (https://phet.colorado.edu/en/simulations/capacitor-
lab )
1.
Go to the "Introduction" tab when you start the simulation. 2.
Select all options on the menu and increase the battery voltage up to +1.5 V.
A capacitor connected to a battery
3.
Increase the plate area and observe the changes in the capacitance, plate charge, stored energy, and voltage across the capacitor. Then, fill out the blanks below. (0.8 pts)
a.
As the area increases, the capacitance ______increase______.
(Reasoning
: C is proportional to A/d, C proportional to A)
b.
As the area increases, the plate charge ______increase______. (Reasoning
: Q = CV, C proportional to A, Q proportional to A)
c.
As the area increases, the stored energy ______increase______.
(Reasoning
: U is proportional to E^2, E proportional to Q, Q proportional to A, U proportional to A^2)
Or U is proportional to ½ (Q^2/C), Q^2 > C, U is proportional to Q)
d.
As the area increases, the electric potential_____the same_______.
(Reasoning
: Q = C * V => V = Q/C => => V is proportional to Q and inversely proportional to C => Q increase and C increase => V stays the same)
4.
Decrease the distance between plates and observe the changes in the capacitance, plate charge, stored energy, and voltage across the capacitor. Then, fill out the blanks below. (0.8 pts)
a.
As the distance decreases, the capacitance ______increase______.
(Reasoning
: C is proportional to A/d, C inversely proportional to d)
b.
As the distance decreases, the plate charge ______increase______.
(Reasoning
: Q = CV, C inversely proportional to d, Q inversely proportional to d)
c.
As the distance decreases, the stored energy ______increase______.
(Reasoning
: U is proportional to E^2, E proportional to Q, Q inversely proportional to A, U inversely proportional to d^2
Or U is proportional to ½ (Q^2/C), Q^2 > C, U is proportional to Q)
Physics Education Technology Project Workshop
2/27/2017
2
d.
As the distance decreases, the electric potential _____the same_______.
(Reasoning
: Q = C * V => V = Q/C => => V is proportional to Q and inversely proportional to C => Q increase and C increase => V stays the same)
5.
From steps 3 and 4, you observed that the plate charge changes when you change the plate area or the
distance between charges. How can the plate collect more charges even though the voltage does not change? (0.5 pts)
Q = C * V, Since V is the same, we have to increase the capacitance for the Charge to increase. Since C is proportional to A/d, we either increase the area of the plate, or decrease the distance between the plate.
A capacitor charged and disconnected from a battery
6.
Click reset all and bring everything back to step 2. (Set the voltage to +1.5V again.) Then click the "Disconnect Battery" button. In the following steps, we will study the behavior of a charged capacitor
without a battery.
7.
Increase the plate area and observe the changes in the capacitance, plate charge, stored energy, and voltage across the capacitor. Then, fill out the blanks below. (0.8 pts)
a.
As the area increases, the capacitance ______increase______.
(Reasoning
: C is proportional to A/d, C proportional to A)
b.
As the area increases, the plate charge ______no change______.
(Reasoning
: No battery, no current, no change in charge that is currently on the plate)
c.
As the area increases, the stored energy _____decrease_______.
(Reasoning
: U is proportional to ½ (Q^2/C), no change in Q but C increase, U is inversely proportional to C)
Physics Education Technology Project Workshop
2/27/2017
3
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Related Questions
Determine the total capacitance, total charge, individual voltage drop and charges across each capacitor. Use two decimal places for your answer. Put your answer for the individual voltage and charge for each capacitor in a table for faster checking. Thank you!
Here are the values for the capacitors:
C1 = 55
C6 = 50
C2 = 25
C7 = 17
C3 = 49
C8 = 44
C4 = 22
C9 = 53
C5 = 45
C10 = 44
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1) First part of the question: Two identical capacitors are connected in
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the charge on each capacitor is 10 µC. Then the power supply is
disconnected and a dielectric with K = 4 is inserted to fill the space
between the plates of one of the capacitors. a) Find now the charge on the
capacitor with dielectric. Give your answer in microcoulombs.
Qo = 10 µC
Qo = 10 µC|
Q2 =? ►
V = 20 V
Battery
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True or false question.
When a capacitor is charging, the voltage of the capacitor increases linearly (i.e., at a constant rate).
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C1= 27 F
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C3= 21 F
C4= 50 F
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C9= 25 F
C10= 16 F
V= 110 V
Note: This topic is under capacitors.
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How will we know if the capacitor is already fully charged?
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What is the role of dielectric in a capacitor?
How does dielectric breakdown occurs?
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Ans. 0.05 Farads
arrow_forward
When we talk about capacitance of capacitor we normally say that capacitance depends on the size, shape, and position of the two capacitors and dielectric constant K. What then did we mean when we say that capacitance is constant in the equation Q = CV?
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R
S
K₁
K₂
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To dissipate energy
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The following figure represents an RC-Circuit with the switch. In Figure A, the
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1) Draw and label the current direction immediately after the switch is closed for each
figure.
2) Consider Figure A. What is the voltage across the capacitor as t → 0? Explain.
3) Consider Figure B. Is the voltage across the resistor increasing, decreasing or
staying the same as t → 0? Explain.
A)
B)
R
C
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Suppose that we have a 1000-pF parallel-plate capacitor with air dielectric charged to 1000 V. The capacitor terminals are open circuited. Find the stored energy. If the plates are moved farther apart so that d is doubled, determine the new voltage on the capacitor and the new stored energy. Where did the extra energy come from?
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Related Questions
- Determine the total capacitance, total charge, individual voltage drop and charges across each capacitor. Use two decimal places for your answer. Put your answer for the individual voltage and charge for each capacitor in a table for faster checking. Thank you! Here are the values for the capacitors: C1 = 55 C6 = 50 C2 = 25 C7 = 17 C3 = 49 C8 = 44 C4 = 22 C9 = 53 C5 = 45 C10 = 44arrow_forward1) First part of the question: Two identical capacitors are connected in parallel and charged with a 20-V power supply as shown in the figure on the left. After the charges on the capacitors have reached their final values, the charge on each capacitor is 10 µC. Then the power supply is disconnected and a dielectric with K = 4 is inserted to fill the space between the plates of one of the capacitors. a) Find now the charge on the capacitor with dielectric. Give your answer in microcoulombs. Qo = 10 µC Qo = 10 µC| Q2 =? ► V = 20 V Batteryarrow_forwardTrue or false question. When a capacitor is charging, the voltage of the capacitor increases linearly (i.e., at a constant rate).arrow_forward
- Determine the total capacitance, total charge, individual voltage drop and charges across across each capacitor. Use two decimal places for your answer. Please put your answer for the individual voltage and charge for each capacitor in a table for faster checking. Thank you! C1= 27 F C2= 53 F C3= 21 F C4= 50 F C5= 17 F C6= 22 F C7= 45 F C8= 16 F C9= 25 F C10= 16 F V= 110 V Note: This topic is under capacitors.arrow_forwardWhen the capacitor is charged current flows on either side of the capacitor. Do electrons cross the gap to allow the current on the other side of the circuit?(b) Is charging and discharging time of capacitor equal in a theoretical RC circuit?Plase explain your answer by using relating formula.arrow_forwardhow do i calculate the inverse capacitance and its uncertainty if the capacitance value 1.8748+/- 0.0006. please show steps im using this example to do my other values.arrow_forward
- Acertain electric circuit has a resistor and a capacitor. The capacitor is initially charged to 100 V. When the power supply is detached, the capacitor voltage decays with time, as the following data table shows. Find a functional description of the capacitor voltage v as a function of time t. Plot the function and the data on the same plot.arrow_forwarda. Show how you would connect all five capacitors to get a maximum capacitance and find the maximum capacitance in terms of C. b. Show how you would connect all five capacitors to get a minimum capacitance and find the minimum capacitance in terms of C.arrow_forwardAnswer the questions completely. Thanks How does a Capacitor store energy? How will we know if the capacitor is already fully charged? What is the role of a capacitor in a certain circuit? What is the role of dielectric in a capacitor? How does dielectric breakdown occurs?arrow_forward
- A 20-ohm resistor and a capacitor are connected in series with a battery of 60 volts. At t = 0, there is no charge on the capacitor. Find the capacitance if the current at t = 5 seconds is 3/e^s amperes. Ans. 0.05 Faradsarrow_forwardWhen we talk about capacitance of capacitor we normally say that capacitance depends on the size, shape, and position of the two capacitors and dielectric constant K. What then did we mean when we say that capacitance is constant in the equation Q = CV?arrow_forwardAt a potential of 7000 V, a simple parallel-plate capacitor will be built to store charge. The capacitor has a separation distance of 0.21 mm between plates and a plate area of 0.030m2.The dielectric constant of a material with a dielectric constant of 6.5 is positioned.in the space between the plates Compute the capacitance of the capacitor and compute the magnitude of the charge stored on each plate.Then,If the capacitance in above has to be increased, choose one acceptable dielectric material from Table 2 below to use between the plates.Justify your mathematical decision.arrow_forward
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SEE MORE QUESTIONS
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Recommended textbooks for you
- Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning