Electronics questions | form four Physics

An electron passes between two plates, one of which A, carries a positive charge and the other B a negative charge. What is the effect on the electron?

Name two semiconductors which are of special importance in electronics.

Distinguish between:
(i) donor and acceptor atoms.
(ii) n type and p type semiconductors.

Study Figure 1 then answer the questions that follow:

(i) Complete the circuit by showing how a pn junction diode should be connected
between X and Y in order for the current to flow.
(ii) Sketch the expected characteristics when the diode is connected in this manner.
(iii) Give the name of the type of connection described in (c)(i) above.
(iv) What will happen within a circuit if the terminals of a battery are reversed?

(i) What is meant by saturation current?
(ii) Give one peculiar property of a diode as a rectifier.

(i) What are the essential features of a capacitor?

What role does a capacitor play when used in
(ii) d.c. circuits?
(iii) a.c. circuits?
Give one example for each.

(i) What happens when a wire is connected to a charged capacitor?
(ii) An insulated plate A having a negative charge is joined to a plate B of positive charge by a resistance wire. If a charge of 10⁶ C flows through the wire of resistance 2 Ω in 10 ^-6 seconds how much heat is dissipated in the wire?

Discuss the differences between conductors and semiconductors in terms of their
sensitivities and conduction bands.

Use the following information to calculate the current gain of a CE amplifier.

1. What do you understand by the term transistor?
2. How a common emitter arrangement of a transistor is stabilized for temeperature changes?
3. Show the circuit symbol for pnptransistor and npn transistor
4. Draw a simple common emitter amplifier circuit using npntransistor as a current amplifier.