# Review Topics Of Electronic |Problems |Discussion Questions

## Review Topics Of Electronics

1. What is the electronics? Define some important applications of electronics.
2. discuss briefly the structure of the atom.
3. Explain how valence electrons define the electrical properties of a material.
4. Explain the constant voltage source and constant current sources. What is their utility?
5. Derive the condition for the delivery of maximum power from a supply to a load.
6. State and elaborate the Thevenin’s theorem.
7. Write short notes on the following :
(i) Atomic structure (ii) Valence electrons (iii) Free electrons

## ProblemsOf Electronics

1. A dry battery generating 12 V has an internal resistance of 10 Ω. determine the output current if load is
(i) 100 Ω (ii) 10 Ω (iii) 2 Ω and (iv) 1 Ω. [(i) 0.1A (ii) 0.6A (iii) 1A (iv) 1.1A]

2. Convert or transfer the current source in Fig. 1.48 into the equivalent voltage supply.
[36 V in series with 900 Ω]

1. Convert or transfer the voltage supply in Fig. 1.49 into the equivalent current source. [3 mA in parallel with 8 kΩ]
2. based on Norton’s Theorem, find the current in-branch AB having 6 Ω resistor of the network shown in Fig. 1.50 [0.466 A]
1. Fig. 1.51 shows Norton’s equivalent circuit of a network behind A and B terminals. transfer it into Thevenin’s equivalent circuit. [2.56 V in series with 1.71 Ω]
1. A power amplifier has an internal resistance of 5 Ω and generates an open-circuited voltage of 12 V. determine the efficiency and power delivered to a load of (i) 20 Ω (ii) 5 Ω. [(i) 80%, 4.6 W (ii) 50%,7.2W]
2. based on Thevenin’s theorem, find the current passes through the galvanometer in the Wheatstone bridge shown in Fig. 1.52. [38.6 µA]
3. Using Thevenin’s theorem, determine the current passes through 4 Ω resistor in the circuit of Fig. 1.53. [0.305A]

## Discussion Questions

1. Why in electronics-free electrons are most important?
2. Why insulators do not have any free electrons?
3. Where we will apply Thevenin’s theorem?
4. Why is maximum power transfer or delivered theorem is most important in electronic circuits?
5. What are the practical applications of a constant current source?

MCQ’s| Electrons|Atomic | Voltage |Thevenin’s

Norton’s Theorem | Chassis and Ground| Properties

Thevenin’s Theorem | Properties | Problems

Maximum Power Transfer Theorem |Applications

Conversion of Voltage Source into constant Current Source