Question

1. If the circuit shown in Fig 3.3, where to be configured as a Class B...

1. If the circuit shown in Fig 3.3, where to be configured as a Class B amplifier, what would be
an appropriate value for the resistance R1 with respect to R2?

2. Explain the need for opto-isolation in AC control using thyristors.

3. Why is a thyristor not ideal for AC power control?

Homework Answers

Answer #1

1: please provide figure to answer this.

2: Opto isolation are used for switching electronic devices like transistors or to provide electrical isolation between low voltage control signal and high output signal.In general these are used in AC or DC power control , computer communication ,and for regulation of power supply.

The noise and voltage spikes of AC power supply can be easily isolated.These opto isolation circuit makes high electrical isolation between input and output voltage.

3:As we know that AC power reverses the polarity periodically and therefore thyristor used in AC circuit will automatically be reversed biased causing it to turn OFF during one half of each cycle.

Once thyristor start to conduct it continues to conduct even with no gate signal , untill anode current decreases below the device holding current I​​​​​​H and below this value it automatically gets turn OFF , therefore in AC circuit the current has to be reduced by separate switch or turn off switch.

This the reason thyristor are not ideal for AC power control.

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A circuit is constructed with an AC generator, a resistor, capacitor and inductor as shown. The...
A circuit is constructed with an AC generator, a resistor, capacitor and inductor as shown. The generator voltage varies in time as ε =Va - Vb = εmsinωt, where εm = 120 V and ω = 318 radians/second. The inductance L = 384 mH. The values for the capacitance C and the resistance R are unkown. What is known is that the current in the circuit leads the voltage across the generator by φ = 35 degrees and the average...
A circuit is constructed with an AC generator, a resistor, capacitor and inductor as shown. The...
A circuit is constructed with an AC generator, a resistor, capacitor and inductor as shown. The generator voltage varies in time as ε = Va - Vb = εmsinωt, where εm = 120 V and ω = 779 radians/second. The values for the remaining circuit components are: R = 111 Ω, C = 351 μF. The value for L is unkown. What is known is that the voltage across the generator leads the current in the circuit by φ =...
Given an RLC series circuit as shown in Figure Q2(b), where L = 5/3 H, R...
Given an RLC series circuit as shown in Figure Q2(b), where L = 5/3 H, R = 10 Ω , C = 1/30 F, and E(t) = 300 V. A): Find the charge across the capacitor in an RLC series circuit. Assume the initial charge on the capacitor is 0 C and the initial current is 9 A. B): What happens to the charge on the capacitor over time? (Hint: Explain the meaning on the answer obtained in I NEED...
Consider the following parallel circuit. The voltage of the battery is 24 volts. Lamp 1 is...
Consider the following parallel circuit. The voltage of the battery is 24 volts. Lamp 1 is rated at 48 watts, and lamp 2 at 72 watts. a) What is the voltage drop (loss) across lamp 1, in volts? b) What is the voltage drop (loss) across lamp 2, in volts? c) What is the current which flows through lamp 1, in amps? d) What is the current that flows through lamp 2, in amps? e) Find the resistance of lamp...
Performing a physics lab where a circuit is set up with a power source that has...
Performing a physics lab where a circuit is set up with a power source that has a voltage panel. The circuit has one resistor, the value is not necessary to understand this question. The voltage across the resistor is then measured by wired voltmeter and by virtual voltmeter. When the circuit is set to be 10 V based on measurement of the wired voltmeter, the panel meter displays 7 V, the wired voltmeter displays 10 V, and the virtual voltmeter...
Please explain this answer in 1-2 paragraphs and include physics concepts. QUESTION: An electrical circuit has...
Please explain this answer in 1-2 paragraphs and include physics concepts. QUESTION: An electrical circuit has three devices each plugged into a standard household powerpoint. Device A has a resistance of 1.0 kΩ (kiloohm), device B has a resistance of 3.0 kΩ and device C has a resistance of 6.0 kΩ. If all three devices are turned on for 15 minutes, what will the total energy consumption of the three devices? ANSWER: Household Powerpoint Device A – 1.0 kiloohm (kΩ)...
1. Answer EITHER part (a) OR part (b). (a) A gas scrubber on an oilrig discharged...
1. Answer EITHER part (a) OR part (b). (a) A gas scrubber on an oilrig discharged gas periodically such that an accumulation of hydrocarbon gas nearby had occurred. A contractor welder was dispatched to a job immediately adjacent to the area and it being a shift change and personnel unavailable temporarily, the welder decided to commence welding. As a consequence, an incident occurred. Describe briefly: (i) what you imagine was the incident including any hazards existing prior to or during...
Homework Draw class diagrams for your HW4 - the Tetris Game shown below: Part 1: UML...
Homework Draw class diagrams for your HW4 - the Tetris Game shown below: Part 1: UML As a review, Here are some links to some explanations of UML diagrams if you need them. • https://courses.cs.washington.edu/courses/cse403/11sp/lectures/lecture08-uml1.pdf (Links to an external site.) • http://creately.com/blog/diagrams/class-diagram-relationships/ (Links to an external site.) • http://www.cs.bsu.edu/homepages/pvg/misc/uml/ (Links to an external site.) However you ended up creating the UML from HW4, your class diagram probably had some or all of these features: • Class variables: names, types, and...
1) 2 point charges are separated by a distance of 8 cm. The left charge is...
1) 2 point charges are separated by a distance of 8 cm. The left charge is 48 mC and the right charge is -16mC. Using a full sheet of paper: draw the 2 charges separated by 8cm, centered in the sheet. (if you are missing a ruler estimate 8cm as ⅓ a paper sheet length). [6] a) Draw field lines to indicate the electric fields for this distribution. [4] b) Draw 3 equipotential surfaces, 1 each, that pass: -Through the...
MTH 241 COMMON DATA ANALYSIS ASSIGNMENT (Fall 2018) Previous studies have shown that urban bus drivers...
MTH 241 COMMON DATA ANALYSIS ASSIGNMENT (Fall 2018) Previous studies have shown that urban bus drivers have an extremely stressful job, and a large proportion of drivers retire prematurely with disabilities due to occupational stress. These stresses come from a combination of physical and social sources such as traffic congestion, incessant time pressure, and unruly passengers. In the paper, “Hassles on the Job: A Study of a Job Intervention with Urban Bus Drivers” (Journal of Organizational Behavior, Vol. 20, pp....