A 12V battery is connected to a capacitor, resulting in 54.0  C of charge stored on the capacitor.  How much energy is stored in the capacitor?

University Physics Volume 2
18th Edition
ISBN:9781938168161
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Chapter8: Capacitance
Section: Chapter Questions
Problem 53P: A parallel-plate capacitor has charge of magnitude 9.00F on each plate and capacitance 3.00F when...
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A 12V battery is connected to a capacitor, resulting in 54.0  C of charge stored on the capacitor.  How much energy is stored in the capacitor?

 

An electric heater carries a current of 13.5A when operating at a voltage of 120V.  What is the resistance of the heater?

Many computer keyboard buttons are constructed of capacitors as shown in Figure. When a key
is pushed down, the soft insulator between the movable plate and the fixed plate is compressed.
When the key is pressed, what happens to the capacitance?
B
Key-
Movable plate-
Insulator
Fixed plate
One type of computer keyboard
button.
a. It increases
b. It idecreases
It changes in a way you cannot determine because the electric circuit connected to the
keyboard button may cause a change in DV
C.
d. Nothing happened
Transcribed Image Text:Many computer keyboard buttons are constructed of capacitors as shown in Figure. When a key is pushed down, the soft insulator between the movable plate and the fixed plate is compressed. When the key is pressed, what happens to the capacitance? B Key- Movable plate- Insulator Fixed plate One type of computer keyboard button. a. It increases b. It idecreases It changes in a way you cannot determine because the electric circuit connected to the keyboard button may cause a change in DV C. d. Nothing happened
QUESTION 7
A 12V battery is connected to a capacitor, resulting in 54.0 µ C of charge stored on the
capacitor. How much energy is stored in the capacitor?
a. 32.4x10-4J
а.
O b. 324J
O c. 0.324mJ
O d. 3.24mJ
QUESTION 8
An electric heater carries a current of 13.5A when operating at a voltage of 120V. What is the
resistance of the heater?
O a. 0.1125 Ohm
O b. 4.5 Ohm
c. 9 Ohm
d. 11.25 Ohm
Transcribed Image Text:QUESTION 7 A 12V battery is connected to a capacitor, resulting in 54.0 µ C of charge stored on the capacitor. How much energy is stored in the capacitor? a. 32.4x10-4J а. O b. 324J O c. 0.324mJ O d. 3.24mJ QUESTION 8 An electric heater carries a current of 13.5A when operating at a voltage of 120V. What is the resistance of the heater? O a. 0.1125 Ohm O b. 4.5 Ohm c. 9 Ohm d. 11.25 Ohm
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