(a) A schematic diagram of a series-parallel network circuit is shown in Fig. Q1(a). Given that...

 

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(a) A schematic diagram of a series-parallel network circuit is shown in Fig. Q1(a). Given that the resistance for R₁ = 20, R₂ = 40, R₂ = 40, R₂ = 40, Rs = 20, and R = 80 respectively. The supply voltage of the circuit is as follows, V₁ = 20V, V₂ = 8V and V 4V. By using Thevenin's theorem for the network between A and B, determine the following = i) the equivalent voltage, VTH ii) the equivalent resistance, RTH iii) the current flow and voltage across R6. iv) the Thevenin equivalent circuit. V₂+ R₁ R₁ R₂ Rs R3 A R6 B (b) Fig. Q1(b) shows a load R₁ requires a voltage of 10 Volt. The load resistance can be varied from 100 to 900 ohms. The available power supply fluctuates from 14 to 22 volts. It is found that the minimum Zener current, Iz is 5 mA. (1) (ii) (iii) What is the required Zener voltage, Vz? What is the required value of resistor R, and its power? Calculate the variation in the Zener current, Iz. 14 V 22 V Unregulated Power Supply Rs V₂ ww (a) A schematic diagram of a series-parallel network circuit is shown in Fig. Q1(a). Given that the resistance for R₁ = 20, R₂ = 40, R₂ = 40, R₂ = 40, Rs = 20, and R = 80 respectively. The supply voltage of the circuit is as follows, V₁ = 20V, V₂ = 8V and V 4V. By using Thevenin's theorem for the network between A and B, determine the following = i) the equivalent voltage, VTH ii) the equivalent resistance, RTH iii) the current flow and voltage across R6. iv) the Thevenin equivalent circuit. V₂+ R₁ R₁ R₂ Rs R3 A R6 B (b) Fig. Q1(b) shows a load R₁ requires a voltage of 10 Volt. The load resistance can be varied from 100 to 900 ohms. The available power supply fluctuates from 14 to 22 volts. It is found that the minimum Zener current, Iz is 5 mA. (1) (ii) (iii) What is the required Zener voltage, Vz? What is the required value of resistor R, and its power? Calculate the variation in the Zener current, Iz. 14 V 22 V Unregulated Power Supply Rs V₂ ww