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The aim of the National Business and Technical Examinations Board (NABTEB) Basic Electricity Syllabus for 2020 is to ensure that you are well prepared for the exam. You may also click here for how to Pass 2020 NABTEBonce and for all without Expo.
Explain the structure of matter and its relevance to electricity/ electronics.
Conductors and insulators
The movement of holes and electrons in a material.
– Holes (+ve charge)
– Electron (-ve charge) – Like charge repel6 – Unlike charges attract.
Elementary concepts of electrons and electron flow. Electric current as a flow of electrons.
1. Difference between insulators
Chart display to illustrate the structure of matter.
Demonstrate the effect of repulsion and attraction by placing two bars of permanent magnets each having North and South poles near each other.
Wire a simple circuit to light a bulb to show the flow of electric current. Demonstrate the methods of measuring currents.
Conductors and Insulators
1. Examples/Types 2. Uses/applications 3. Relationship with semi conductors.
1. Examine various types of conductors and insulators.
OHM’s Law and its Application
Define OHM’s Lawand calculate resistance, voltage and current using OHM’s Law
Connect resistors, batteries, inductors, capacitors in series and parallel stating the implications of the various connections.
Quantitative treatment of Kirchoff’s Laws.
Relationship between resistance, Voltage and current using ohm’s law e.g. R=V1
Resistors in series, andparallel circuits.
Batteries in series, paralleland series parallelconnection.
Inductors in series andparallel.
Capacitors in series, paralleland series-parallel.
Series connection RT = R1+R2+R3 …… R
Parallel connection 1 = 1 + 1 + 1 …. 1
RT R1 R2 R3 … Rn
Verify bymeasurement and calculation.
Examine resistors connected in series parallel and series parallel.
Examine batteries connected in series, parallel and series- parallel
examine inductors connected in series and parallel.
Examine capacitors connected in series, parallel and series- parallel.
Determine the value of the: a. total resistance of
resistors in series parallel and series parallel connection.
b. total voltage of batteries in series, parallel and series parallel connection
c. total inductance of inductors in series, and parallel and series parallel.
d. total capacitance of capacitors in
series, parallel and series-parallel. Determine the value of inductance and capacitance connected in series and parallel. Determine values of current junction. determine that total Emf and Pds is equal to zero.
and its advantages over Ohms Laws. IT = I1 + I2 + I3 ET = E1 + E2 + E3
10. Use Vector diagram to explain the current law e.g. I1 + I2 + I3 = I3 + I4
Resistors, Capacitors and Inductors Identify and state the function of the various types and sizes of resistors, capacitors and inductors.
Types of resistors, capacitors and inductors.
composition type resistor
wire wound resistor
variable and fixedcapacitor andinductors.
Unit of resistors,capacitors andinductors.
Functions of resistorscapacitors and inductors.
Detail construction ofResistors, capacitors andinductors.
Resistor’s power rating.
Power rating of resistorcapacitor and inductor.
Application of varioustypes of Resistors.
Working voltage of acapacitor.
Examine and identify various sizes ofresistors, capacitors and inductors. ”“ state their values.
Discuss the functions of resistors capacitors and inductors.
Construct a simple Resistor, inductor and capacitor.
Examine and state the power rating of some resistors.
Examine the power rating of inductors, capacitors and resistors.
Mention the application of each component.
Verify by measuring the working voltage of a capacitor with voltmeter.
Values and Functions of Resistors Explain the colour coding system of resistors and capacitors and calculate their resistance, capacitance and tolerance from their colour codes.
Colour coding system of resistors and capacitors.
Resistors and capacitors and their tolerance through the components colour codes.
Tolerance of resistors and capacitors.
Value of tolerance of any resistor and Capacitor.
Examine samples of colour coding resistors and capacitors.
State their values.
Examine the Toleranceof resistors andcapacitors.
Calculate the toleranceof resistor and Capacitor through their colour codes.
Electromotive Force (E.M.F.)
Define and distinguish the e.m.f. from the potential difference (P.D.)
Identify primary and secondary cells and explain the effect of resistance on battery output.
Work, Poser and Energy.
e.m.f., P.d.: Difference between e.m.f. and p.d.
Types of batteries
Description and characteristics
Methods of charging.
Series, parallel, series-parallel cell connection
Emf total = E 1 + E2 + E3
EmfT ”“ Emf of any one cell where all cellsare of equal voltage.
EmfT = No. of cells in series x e.m.f. per cell
7. Reduction in battery’s current output
Discuss power, energy, and work and how they related with each other.
Connect battery terminals to external load to give room for p.d.
Examine various types of batteries and identify their components. Parts ”“ measure their e.m.f. and record them.
Test the condition of a cell by measuring its voltage with a voltmeter. Use hydrometer to test the specific gravity of a secondary cell.
Carry out the wirings of series, parallel and series ”“ parallel on a wiring board. Measure their e.m.fs.
Connect variable resistance to the battery terminals and examine its effect.
AC & DC
Distinguish between AC and DC
Define and explain peak value, mean value, r.m.s. value, frequency of wave.
Explain and calculate inductive and capacitive reactance.
Difference between AC and DC
Characteristics of alternating current
phase and amplitude
addition andsubtraction of sinewaves
Peak value, mean value,r.m.s. value, frequency of wave
Display on the cathode ray oscilloscope the signals associated with AC and DC.
Plot the sine waves to indicate phase shift and compare results with those observed in the CRO.
Identify on a cathode ray oscilloscope peak value, mean value and calculate for r.m.s.
Peak value from r.m.s value of current, voltage and vice versa.
Simple treatment of R, L, C and AC Circuits
Basic concept of resistance in Ac Circuit
Inductive and capacitive reactance.
concept and definition
symbols and unit of measurement.
Simple problemsinvolving complexnumbers.
Ohm’s law in a pureinductive and pure capacitive circuits.
value and frequency of
Calculate peak value from r.m.s. value of current, voltage and vice-versa.
Display on the C.R.O. input and output signals associated with the following i. RC ii. LC iii. RLC Adjust R and C as appropriate to obtain resonance.
Construct a simple experiment involving resistance in AC circuits.
Solve simple problems involving inductive and capacitive reactance.
Application of Ohm’s law, in a pureinductive and capacitive circuits.
Analyse, connect and carry out simple calculations on simple electrical circuits.
Difference between series and parallel circuits
Total Resistance in series DC circuit.
Voltage drop across series connected resistor.
Total resistance in parallel circuit.
Effect of resistors in series and parallel circuits.
Current in each arm of a parallel circuit.
Total voltage and current in a series and parallel connected cells.
V oltage and current in a series-parallel circuit.
Explain the difference between series and parallel circuits.
Calculation of total Resistance in series DC circuit.
Calculate the voltage drop across series connected resistor.
Calculate the Total resistance in parallel circuit.
Perform experiments by wiring circuits of series and parallel connections to show their effects.
Effect of capacitor in an electric circuit.
Current and voltage relationship in:
an inductive circuit I1 lag E2
capacitive circuit Ec lags Ic
the combination of capacitor and inductor: a.in series b.in parallel
Impedance in an AC circuit
Resonance in:i. Series
ii. Parallel circuits.
Circuit symbols used inschematic diagram
Q-factor and Band-width.
Calculate Current in each arm of a parallel circuit.
Calculate Total voltage and current in series and parallel circuit.
Calculate the voltage and current in a series- parallel circuit.
Wire a simple circuit to show the effect of capacitor in an electric circuit.
Draw a phase diagram to show how I1 lag E2 by 90 and Ec lags Ic by 90.Draw a phase diagram to show the resultant effect of capacitors and inductors connected in a series.
Solve simple problemsinvolving impedance showing its relationship with voltage and current in an AC circuit i.eI= V, Z = V ZI
Solve simple problems involving resonance.
Chart display of different types of symbols used in schematic diagrams.
Solve simple problems on resonancefrequency.
Indicating Instruments and Measuring Instruments
1. Functional part of multi- meter:
1. Discuss the functional parts of a multimeter.
2. Connect: i. Ammeter in series
Explain the operation, uses and limitations of indicating and measuring instruments and operate them.
Measurement of current,voltage and resistance in ACand DC circuits.
Ohmeter for testingsemiconductors devices.
to measure the current flowing in AC and DC circuits.
ii. Voltmeter in parallel to measure the voltage flowing in AC and DC circuit.
Use ohmmeter to measure resistance in AC and Dc circuit.
Compare the readings of two three or more meters together and identify the faulty one.
Magnetism, induction and Transformers
Explain theconcept of magnetism and understand the principles of a transformer, its construction and operation.
Explain the concept ofelectromagneticinduction.
Identify thevarious types of transformers, calculate transformer efficiency and construct a simple single-phase double wound transformer.
Basic concepts of magnetism.
Basic concepts of electromagnetic
Magnetic field strength
iii. Magnetic flux iv. Magnetic Flux density. Effect of field as applied to electromagnetism.
Relation of field in an ideal transformer.
Principle of induction.
Difference between self induction and mutual induction
Colour codes used for winding of transformers.
Basic principles of a single phase, doubt wound transformer.
mutual inductance conservation of energy
Solve simple problems involving magnetic circuits.
Demonstrate the effect of an induced e.m.f by means of a galvanometer pointer. Discuss the relation of field in an ideal transformer.
Plot magnetic field due to current in:
a long straightconductor
a long solenoid
iii. two parallel
Examine and discussthe single phase double wound transformer as approximate constant voltage device.
Examine the different colour codes used for the winding of transformers.
transformers ”“ magnetic circuit (core)
iv. primary windings ”“ Turns ratio-cooling
Core lamination of a transformer.- Reasons
Types of losses intransformers.
(Eddy current and hysteresis losses)
Detailed construction of asimple single phase doublewound transformer.
Types of transformersi. single phase ii. three phase (star &delta connections) iii. auto-transformer iv. E-type transformer v. C-Core transformer vi. Toroidal Transformer vii. Rop/lot transformer viii. Output transformer ix. 3-phase transformer x. Current transformer
Examine and discuss the single-phase double wound transformer as approximate constant voltage device.
Examine the laminating of the core of a transformer.
discuss transformer Losses.
Calculation of transformer efficiency.
Construct a simple single phase double wound transformer.
Visit an electrical workshop and identify various types of transformers.
Fluxes, Solders and Soldering Explain principles of soldering and solder various electric and electronic connections.
Basic concepts of soldering
Types of ironsi. Soldering ii. Electric iii. Ordinary
Types of fluxes i. Composition ii. application
Sources of heat i. electric ii. battery
Cleaning of wire surfaces.
Introduction to different types of soldering.
Examine different types of iron
Examine different types of fluxes
demonstrate the use of electric or battery for soldering
Demonstrate cleaning of wire surfaces
Demonstrate soldering of wires with the use
Soldering of wires
Cold solder joint and dry joint
Scrapping of wires
Methods of termination
twisted loop termination
claw type termination
shade and termination
crimped end termination
electric soldering iron
iii. plot and ladle
Discuss cold solderjoint and dry joint.
Demonstrate how wires are scrapped forsoldering.
Demonstrate different methods of wiretermination.
Demonstrate howcables are joined together.
Electronic Signs and Symbols Draw and interpret basic electronic/electrical signs and symbols.
Abbreviation in electrical/electronics circuits
Graphical symbols used in electrical/electronics systems.
iii. switch iv. socket outlet
Explain the meaning of abbreviation used in electrical circuits.
Display a chart showing Graphical symbols used in electrical/electronics systems
Wiring and Connection of Electrical/Electronic Component
Wire different types of plugs and assemble components on a chassis
Types of plugs i. Mainsii.Coaxial iii.Phone iv. Jack plugs
Soldering and wiring of components to: i. tag boards ii. stripsiii. printed boardiv. vero-board.
Assembling of componentson a chassis
Examine different types of plugs.
Demonstrate howsoldering and wiring of components are being carried out.
Demonstrate how components are being assembled on chassis.