Capacitance A2

Question 1

What is capacitance

Answer 1

Charge per unit voltage

Question 2

What are uses of capacitance

Answer 2

Storage of charge, smooth of AC

Question 3

What is unit for capacitance

Answer 3

Farad

Question 4

What is the total capacitance if two capacitors are connected in series

Answer 4

1/C = 1/c + 1/c

Question 5

What is the total capacitance if two capacitors are connected in parallel

Answer 5

C = c + c

Question 6

How to calculate energy stored in a capacitor

Answer 6

1/2CV^2 or 1/2QV (area under charge vs pd graph)

Question 7

What is the time constant

Answer 7

RC, where voltage is 0.37 times the original voltage, during discharge

Question 8

Describe the graph of charging a capacitor with charge or voltage vs time

Answer 8

Rapid increase at first, then levels out

Question 9

Describe the graph of discharging a capacitor with charge or voltage vs time

Answer 9

Rapid decrease at first, then levels out

Question 10

How do capacitors store charge

Answer 10

Work is done to separate charges and energy is transferred when charges combine

Question 11

Capacitors have…

Answer 11

Charge separations