5.2 Energy storage by capacitors Flashcards Preview

A-Level Physics EDEXCEL Year 2 > 5.2 Energy storage by capacitors > Flashcards

Flashcards in 5.2 Energy storage by capacitors Deck (10)
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1
Q

What type of energy can capacitors store?

A

electric potential energy

2
Q

When do capacitors store energy?

A

When charge carriers(due to attracton and repulsion at plates) move across a pd supplied by power supply.

3
Q

What is the equation for energy stored by a capacitor?

A
W  = 1/2QV 
where 
w = work done/energy transferred 
q = charge 
v = pd
4
Q

In a V against Q charge what is the area under the graph?

A

Work done or energy stored by capacitor?

5
Q

What does a V/Q graph look like for a charging capacitor?

A

Straight line through the origin,

6
Q

Where does the equation w = 1/2qv come from?

A

The fact that the area of a V/Q graph is a triangle, since the two are proportional to each other.

7
Q

What is the relationship between q and v of a capacitor?

A

Theyre proportional , this can be seen from a straight line graph

8
Q

What is the energy stored by a capacitor the same as?

A

The energy transferred by battery

9
Q

How can we find other equations for energy stored by a capacitor?

A

Incorporating equation Q = CV and V = Q/V

10
Q

What are the other 2 equations for work done of battery or energy transferred to capacitor?

A
w = 1/2cv^2 
w = 1/2q^2/c

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