1. A voltage regulator with a no-load output dc voltage of 12 V is connected to a load with a resistance of 10 ohms. If the load resistance decreases to 7.5 ohms, the load voltage will decrease to 10.9 V. What is

In the circuit of figure Nº A, the secondary voltage Vs is 15 volts rms with a frequency of 60 Hz, R equal to 100 Ohms and C equal to 1000 microfarads. The diodes are silicon (Vd = 0.7 volts) and the Zener diode is 15 volts. Determine:a) The magnitude of the ripple voltage at Cb) The Magnitude of the Peak Inverse Voltage (PIV) for D1 and D2

2. The rms value of the primary voltage, Vpri of a transformer with centre tapping in Figure 2 is 320/12 V. The turns ratio Nori: Nee is 10. Assuming ideal diodes, sketch the output voltage, Vo 3. Nr Ne D₁ K KH D₂ Figure 2 V, ~ VR R V₂=SV Figure 3 By assuming ideal zener diode, sketch the voltage across R, VR for the circuit in Figure 3 (V, 10 sin oot V). = FS markel

4) For single-phase half-controlled bridge rectifier shown in the figure : 1. Derive a formula for mean load voltage. 2. Draw the waveforms of Vosis w i3, ių and io assuming highly inductive Load and <=45°. T, 12

solve a and b

The current and voltage characteristics of the Diode and the Zenner diode in the circuit in Figure 1 are on the side.has been given.a) Obtain the i-v current-voltage characteristic of the circuit.b) Find out what are the currents I, I1 and I2 for v = 5 Volts.c) Find out what are the currents I, I1 and I2 for v = -5 Volts.

Kvl (Note: resistance of diode )

QUESTION 2 Given is a voltage regulator with a nominal output voltage Vo=11V. When the load current varies between 0.1A and 5A, the output voltage varies between 10.8V and 11V. - Determine the load regulation in percent, write the answer without the unit.

1. The no-load terminal voltage of a battery is 30 V. The terminal voltage drops to 22 V when supplying a current of 5 A. Determine the emf and the internal resistance of this battery. Ans. r= 1.6 ohm 2. Two identical zinc carbon batteries are available. When connected in series, they supply 0.5 A to a 4 ohm resistor. When connected in parallel, they supply 0.4 A to a 5 ohm resistor. Determine the emf and internal resistance of each battery. Ans. 2.667 V and 3.333 ohm 3. When supplying a current of 5 A, the terminal voltage of a battery is 15 V. The battery is then recharged at a rate of 3 A and the terminal voltage is found to be 21 V. Determine the emf and the Internal resistance of the battery. Ans. 18.75 V and 0.75 ohm 4. A battery with an emf of 12 V and an internal resistance of 0.8 ohm is to be recharged through a 20 V source. (a) show by means of a diagram the connection of the circuit elements. (b) What is the current in the circuit? (c) The recharging current is to be…

You are an electrician working on an overhead crane. The crane uses a large electromagnet to pick up large metal pipes. The magnet must have a minimum of 200 VDC to operate properly. The crane has an AC source of 240 V. You are given four diodes that have a peak voltage rating of 400 V each. These diodes are to be used to form a bridge rectifier to convert the AC voltage into DC voltage. Is the voltage rating of the diodes sufficient? To the nearest volt, what will be the DC output voltage of the bridge rectifier?