Capacitance (21)

Question 1

What is the circuit symbol for capacitance

Answer 1

• ||-

Question 2

What is the basic design of a capacitor

Answer 2

Two terminals separated by an insulator

Question 3

When the PD across the capacitor is =EMF…

Answer 3

the current is zero

Question 4

Definition of capacitance

Answer 4

charge stored per unit PD

Question 5

To types of common capacitors

Answer 5

electrolytic and ceramic

Question 6

unit for capacitance

Answer 6

farad

Question 7

Capacitance in parallel

Answer 7

added

Question 8

Capacitance in series

Answer 8

add reciprocals

Question 9

Why is there a difference between capacitance in series and in parallel

Answer 9

parallel, the charge is added, PD is same

Series, charge is the same, PD added

Question 10

How does a resistor affect capacitor circuits

Answer 10

slows charging or discharging, doesn’t change capacitance

Question 11

What determines whether series or parallel

Answer 11

PD

Question 12

What is work done

Answer 12

area on a Pd charge graph

Question 13

What is key characteristic of discharge

Answer 13

exponential decay

Question 14

What decays exponentially in a dischage

Answer 14

Charge across capacitor
Current in circuit
PD across capacitor

Question 15

What is different in charging equation

Answer 15

X=Xo(1-e^-t/T)

Question 16

Charging circuit what decays exponentially

Answer 16

current

Question 17

What is always constant in an charging circuit, why?

Answer 17

PD across capacitor and resistor

Kirchoff’s second law

Question 18

How do capacitors convert AC into DC

Answer 18

Use a diode (only allow current one way), AC input charges capacitor, capacitor decays a little in gap when AS is going the other way

Question 19

What is one thing that is useful about capacitors when used with flashes

Answer 19

can store charge, which if released over a short time scale can be high power