lesson 6 Flashcards
The ? section of a power supply works to provide a smoother DC output.
filter
The AC component in a DC power supply is called ripple, and much of the ripple must be ? .
removed
Which is the most common type of capacitor used in power supplies?
Electrolytic
The life of the capacitor will be greatly reduced if the applied voltage exceeds the voltage rating.
true
The voltage rating of a capacitor indicates the maximum amount of voltage the ? is intended to withstand without breaking down.
dielectric
To be effective, a filter capacitor should completely discharge between half cycles.
false
Which formula is used for determining the time constant of a capacitor filter circuit?
T=RC
T is time in seconds.
R is resistance in ohms.
C is capacitance in farads.
What is the time constant for a 250-ohm load in parallel with a 500-microfarad capacitor?
T=RC
250x0. 0005
0. 125 second
Another name for an inductive filter is a ? .
choke
The inductive filter opposes change in ? at the same rate that the capacitor opposes the change in ? .
current/voltage
How many time constants does it take for an inductor to reach maximum current induction?
5
A ? allows lower frequency current to pass, while attenuating unwanted frequency currents.
low-pass filter
? are best used with unregulated power supplies that have high current demands.
chokes
The ? in the circuit is used to regulate the power supply.
zener diode
Other than the device currently used to regulate this circuit, what type of device could also be used to regulate the power supply?
adjustable resistor
