Answers350CR Integrated ScienceEnergy Transformations

Electric Energy Storage Answers

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1
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What is the SI unit for capacitance?

A
farad (F)
B
volt (V)
C
joule (J)
D
ampere (A)
2
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Why are the plates in a capacitor parallel to each other?

A
to allow each plate to become positively charged
B
to form a uniform electric field between the plates
C
to establish a potential difference between the plates
D
to allow each plate to hold the same amount of charge
3

A capacitor stores 7.6 × 10–11 C when the electric potential difference between the plates is 5.8 V.

A
6.6 × 10–12 J
B
4.4 × 10–10 J
C
2.2 × 10–10 J
D
1.3 × 10–9 J
4

What is the result of changing the dielectric in a capacitor to a dielectric with a larger dielectric constant?

A
The capacitor will have a lower charge at a given potential energy.
B
The capacitor will have a higher potential difference at a given potential energy.
C
The capacitor can store less potential energy at a given potential difference.
D
The capacitor can store more charge at a given potential difference.
5

A capacitor is connected to a power source and begins charging.

A
The power source runs out of electrons to send to the charged plate.
B
No additional positive charges can be moved onto the second plate.
C
The charged plates attract each other and touch, causing a discharge.
D
Electrons are too strongly repelled from the negatively charged plate.
6

How is capacitance related to the distance between the plates of a capacitor?

A
It is directly proportional, so the capacitance increases as the distance increases.
B
It is inversely proportional, so the capacitance increases as the distance increases.
C
It is directly proportional, so the capacitance decreases as the distance increases.
D
It is inversely proportional, so the capacitance decreases as the distance increases.
7

Rami uses a disposable camera that has a flash. When he wants to take a picture, he holds a button and hears a rising whining sound. When a small light glows, the flash is ready. He presses the shutter button, the flash lights up, and he takes his picture.

A
It protects the circuits from a burst of energy by storing charge.
B
It protects the circuits from a steady current by storing charge.
C
It stores energy and delivers it in a short burst.
D
It stores energy and delivers it in a steady current.
8

What is the amount of charge a capacitor can store per volt of potential difference?

A
permittivity
B
dielectric constant
C
capacitance
D
electric potential energy
9

A power source of 6.0 V is attached to the ends of a capacitor. The charge is 12 C.

Question illustration
A
0.50 μF
B
2.0 μF
C
6.0 μF
D
72 μF
10

What is the measure of how much a material resists the formation of an electric field?

A
permittivity
B
dielectric
C
capacitance
D
resistance

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