Radio transmission and reception
Describe the principle of radio transmission and reception (AM and FM).
Explain each stage of a radio receiver ( AM and FM).
State the relative advantage of FM over AM.
Demonstrate how to detect faults in a radio receiver.
Power supply unit
Explain Rectification
Explain the differences between half wave and full wave rectification.
Explain how a.c is converted to d.c. by the use of rectifiers.
State the meaning of voltage regulation.
Explain the operation of voltage regulators
Integrated Circuits (IC) and microprocessors
Explain the concept of Integrated circuit (IC).
State the advantages and disadvantages of IC.
State the applications of IC.
Explain the concept of microprocessor
Explain the following terms as related to microprocessor: RAM, ROM, and EPROM.
Mention applications of microprocessor.
Transistors
Explain the concept of a transistor
Explain biasing of a transistor.
Explain bipolar transistor circuits
Explain types of transistors and symbols.
Explain applications of transistors
Power in AC circuits
Explain power and power triangle.
Explain power factor and power factor correction.
State advantages and disadvantages of power factor correction.
Calculate power factor in a given AC circuit.
Explain Q-factor and bandwidth.
Alternating current circuits
Define the terms:
– capacitive reactance
– inductive reactance
– Impedance
Explain RL and RC
Explain RLC circuit.
Calculate inductive and capacitive reactance (XL and XC).
Explain series and parallel resonance
Calculate series and parallel resonance.
Semiconductor diodes
Explain the concept of diodes
Differentiate between the types of diodes.
State the operational principles of Semiconductor diodes
State the rating of diode
State the applications of the different types of diodes.
Construct simple circuits using semiconductor diodes.
Semiconductor
Explain the concept of semiconductor
List different types of semiconductor materials.
Explain how doping of semiconductor is achieved.
Explain the process of formation of p – type and n-type semiconductor.
Explain the forward and reverse biasing of semiconductors.
Electron emission
Distinguish among the four different types of electron emission.
State the application of the four types of electron emission
Electromagnetism
Explain the terms:
– electric field
– electromagnet
-electromagnetism
– inductance
State the applications of electromagnetism, (e. g. electric bell, relays, transformer, etc)
Describe the principle of operation of a transformer.
Magnet and magnetic field
Define the following terms:
– magnetism
– magnetic poles
– magnetic field
– magnetic materials
Differentiate between permanent and temporary magnets
Demonstrate the law of attraction and repulsion of a magnet
State the applications of magnetism (e.g. Zip drive disk, floppy disk, magnetic tape).
Electric circuits
Explain the meaning of electric circuit.
Identify types of circuit boards.
Explain different circuit arrangements
Calculate resistance in:
i. Series
ii. Parallel, and
iii. Series-parallel.
Circuit components
State the different types of resistors, capacitors and inductors.
State the symbols, signs and units of the components mentioned in (1) above.
Identify different colour coding and rating of resistors and capacitors.
Electric Power
Define electrical power.
State the unit and instrument for measuring electrical power.
Explain the relationship between power, current and voltage.
Derive other formulae for power in a given circuit.
Calculate power in a given circuit.
Relationships between current, voltage and resistant
Explain the following quantities: voltage, current and resistance.
State the units, symbols and instruments for measuring the quantities mentioned in (1) above.
State Ohm’s Law.
Perform a simple experiment to determine Ohm’s Law.
Calculate current, voltage and resistance in a given circuit.
Electric current
Explain the structure of atom.
Define conductors and insulators
State uses of conductors and insulators.
Distinguish between direct and alternating current.
Explain the sources of direct and alternating current.
Electrical Appliances
Define electrical appliances
Classify electrical appliances.
Maintain and repair electrical appliances.
Energy Conversion
Explain the meaning of energy conversion.
The relationship between electrical, mechanical and thermal energy.
Explain the process of energy conversion.
Energy
Define energy and state its unit.
Explain various types of energy.
Protective Devices
Explain the need for protective devices in electrical installation,
Identify types of protective devices.
Explain the operating principles of protective devices.
State the functions of protective device e.g. fuse, circuit breakers, and contactors