PLEASE GIVE THE ANSWER ACCURATE CORRECT ANSWER? Given: Two AC sources power RL t

Question

PLEASE GIVE THE ANSWER ACCURATE CORRECT ANSWER?

Given: Two AC sources power RL through a full wave rectifier circuit below. The voltage Vs is a square wave which is positive for half the time and negative for the other half of the time. 1. When Vs is positive, Which diode is on or conducting? (A) Both D1, D2 (B) D1, Only (C) D2, Only (D) Neither 2. If each of the diodes D1 through D2 is not ideal, but has a forward voltage drop of 1.75 volts, what is the voltage seen across RL? (A) 12 V (B) 10.25 V (C) -12 V (D) 10.5 V 3. A 12 V battery, a resistor and an LED with a forward voltage drop of 2.5 volts are all connected in series. What resistor will give an LED current of about 20 mA? (A) 390 Ohm (B) 430 Ohm (C) 470 Ohm (D) 510 Ohm 4. A half wave battery charger consists of a 14 V (peak) sine wave source, and a single diode with a forward voltage drop of 1.0 volts to charge a 12 V battery. Being a sine, the voltage is zero at 0 degrees. At about what angle does t he diode first turn on? (Hint: draw the circuit including the 12 V battery, chose the closest value to your answer.) (A) 360 degrees (B) 60 degrees (C) 70 degrees (D) 80 degrees

Explanation / Answer

1. (B)

2. (B)

3. (C)

4. (C)

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