Electrical Circuits Flashcards
The 60 Hz AC input is applied through TP1 to which two components?
R5 and T1
One path of the AC input flows through R5 to TP7 and R6 to R7.
What type of circuit best describes R5, R6, and R7?
Voltage divider
What type of component is T1?
Center tapped transformer
The circuit from the secondary of T1 to C2 would be what?
The circuit from the secondary of T1 to C2 is a power supply.
What is the purpose of S1?
S1 selects between the components L1 and R0.
The circuit from the secondary of T1 to C2 is a power supply. What is the purpose of a power supply?
The purpose of a power supply is to change AC power into DC power.
Because of T1’s center tapped secondary, the AC output signals at TP2 and TP3 are opposite. The opposite AC signals are applied to CR1 and CR2, which are electronic components called ______. They rectify the AC.
DIODES
When a positive voltage is applied, a diode is _____. These types of diodes allow current to flow.
When a positive voltage is applied, a diode is forward biased. Forward biased diodes allow current to flow.
When a negative voltage is applied, the diode is _____. No current flows through this type of diode.
When a negative voltage is applied, the diode is reverse biased. No current flows through a reverse biased diode.
Explain what is happening between time 1 & time 2 with the diodes.
During time 1
- CR2 conducts, producing a voltage at TP4, and CR1 does not conduct.
- CR2 is forward biased, CR1 is reverse biased
During time 2
- CR1 conducts, producing a voltage at TP4, and CR2 does not conduct.
- CR2 is reverse biased, CR1 is forward biased
CR1 & CR2 take turns producing a voltage at TP4 with the negative alternations removed from the sine wave. This type of waveform is called pulsating DC.
C1, C2, and L1 (or R0) eliminate the bumps, called ripple, on the DC voltage. This is called ____.
C1, C2, and L1 (or R0) eliminate the bumps, called ripple, on the DC voltage. This is called filtering.
A pure DC signal is the result at TP6.
The first path is through R1 and R2. What type of circuit is R1 and R2?
Voltage Divider
When will I3 illuminate the brightest?
At the resonance of L1 and C1
The reactance of a parallel LC circuit is maximum at resonance and that this LC circuit is connected to ground.
What type of signal is present at TP6 of circuit 1?
Pure DC
Which voltage divider supplies a DC signal through K1 to circuit 2?
R1 and R2 in circuit 1
In circuit 2, which voltage divider supplies an AC signal to K1?
R5, R6, and R7 in circuit 1
What is the phase relationship of the AC signal on TP2 and TP3?
180° out of phase
With K1 energized, what is the output on TP10?
DC
The purpose of C1, L1, and C2 in circuit 1 is to _______.
filter DC power
Which voltage divider supplies the energizing voltage to K1 in circuit 2?
R3 and R4 in circuit 1
With K1 de-energized, what is the output on TP10?
AC
What type of circuit does L1 and C1 form in circuit 3?
LC parallel
