NABTEB Basic Electricity Syllabus 2022

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6.

Electromotive Force (E.M.F.)

1. Define and distinguish the e.m.f. from the potential difference (P.D.)
2. Identify primary and secondary cells and explain the effect of resistance on battery output.

1. Work, Poser and Energy.
2. e.m.f., P.d.: Difference between e.m.f. and p.d.
3. Types of batteries
   1. Leclanche
   2. Lead-acid
   3. Description and characteristics
   4. Methods of charging.
4. Cells
5. Series, parallel, series-parallel cell connection

6.

1. Emf total = E 1 + E2 + E3
2. EmfT ”“ Emf of any one cell where all cellsare of equal voltage.
3. EmfT = No. of cells in series x e.m.f. per cell

7. Reduction in battery’s current output

1. Discuss power, energy, and work and how they related with each other.
2. Connect battery terminals to external load to give room for p.d.
3. Examine various types of batteries and identify their components. Parts ”“ measure their e.m.f. and record them.
4. Test the condition of a cell by measuring its voltage with a voltmeter. Use hydrometer to test the specific gravity of a secondary cell.
5. Carry out the wirings of series, parallel and series ”“ parallel on a wiring board. Measure their e.m.fs.
6. Connect variable resistance to the battery terminals and examine its effect.

7.

AC & DC

1. Distinguish between AC and DC
2. Define and explain peak value, mean value, r.m.s. value, frequency of wave.
3. Explain and calculate inductive and capacitive reactance.

1. Difference between AC and DC
2. Characteristics of alternating current
   1. phase and amplitude
   2. addition andsubtraction of sinewaves
   3. wave plotting
   4. vector diagrams
3. Peak value, mean value,r.m.s. value, frequency of wave

1. Display on the cathode ray oscilloscope the signals associated with AC and DC.
2. Plot the sine waves to indicate phase shift and compare results with those observed in the CRO.
3. Identify on a cathode ray oscilloscope peak value, mean value and calculate for r.m.s.

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4. Peak value from r.m.s value of current, voltage and vice versa.
5. Simple treatment of R, L, C and AC Circuits
6. Basic concept of resistance in Ac Circuit
7. Inductive and capacitive reactance.
   1. concept and definition
   2. symbols and unit of measurement.
   3. Simple problems
   4. Simple problemsinvolving complexnumbers.
8. Ohm’s law in a pureinductive and pure capacitive circuits.

value and frequency of

wave.

4. Calculate peak value from r.m.s. value of current, voltage and vice-versa.
5. 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.
6. Construct a simple experiment involving resistance in AC circuits.
7. Solve simple problems involving inductive and capacitive reactance.
8. Application of Ohm’s law, in a pureinductive and capacitive circuits.

8.

Electrical Circuits

Analyse, connect and carry out simple calculations on simple electrical circuits.

1. Difference between series and parallel circuits
2. Total Resistance in series DC circuit.
3. Voltage drop across series connected resistor.
4. Total resistance in parallel circuit.
5. Effect of resistors in series and parallel circuits.
6. Current in each arm of a parallel circuit.
7. Total voltage and current in a series and parallel connected cells.
8. V oltage and current in a series-parallel circuit.

1. Explain the difference between series and parallel circuits.
2. Calculation of total Resistance in series DC circuit.
3. Calculate the voltage drop across series connected resistor.
4. Calculate the Total resistance in parallel circuit.
5. Perform experiments by wiring circuits of series and parallel connections to show their effects.

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9. Effect of capacitor in an electric circuit.
10. Current and voltage relationship in:
    1. an inductive circuit I1 lag E2
    2. capacitive circuit Ec lags Ic
    3. the combination of capacitor and inductor: a.in series
       b.in parallel
11. Impedance
12. Impedance in an AC circuit
13. Resonance in:i. Series

ii. Parallel circuits.

14. Circuit symbols used inschematic diagram
15. Q-factor and Band-width.
16. Resonance frequency.

6. Calculate Current in each arm of a parallel circuit.
7. Calculate Total voltage and current in series and parallel circuit.
8. Calculate the voltage and current in a series- parallel circuit.
9. Wire a simple circuit to show the effect of capacitor in an electric circuit.
10. 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.
11. Define impedance.
12. Solve simple problemsinvolving impedance showing its relationship with voltage and current in an AC circuit i.eI= V, Z = V ZI
13. Solve simple problems involving resonance.
14. Chart display of different types of symbols used in schematic diagrams.
15. Solve simple problems on resonancefrequency.

9.

Indicating Instruments and Measuring Instruments

1. Functional part of multi- meter:

1. Ammeter
2. V oltmeter

1. Discuss the functional parts of a multimeter.

2. Connect:
i. Ammeter in series

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Explain the operation, uses and limitations of indicating and measuring instruments and operate them.

iii. Ohmeter

2. Measurement of current,voltage and resistance in ACand DC circuits.
3. Ohmeter for testingsemiconductors devices.
4. Faulty meters.

to measure the current flowing in AC and DC circuits.

ii. Voltmeter in parallel to measure the voltage flowing in AC and DC circuit.

3. Use ohmmeter to measure resistance in AC and Dc circuit.
4. Compare the readings of two three or more meters together and identify the faulty one.

10.

Magnetism, induction and Transformers

1. Explain theconcept of magnetism and understand the principles of a transformer, its construction and operation.
2. Explain the concept ofelectromagneticinduction.
3. Identify thevarious types of transformers, calculate transformer efficiency and construct a simple single-phase double wound transformer.

1. Basic concepts of magnetism.
2. Basic concepts of electromagnetic
   1. Magnetomotive force
   2. Magnetic field strength

   iii. Magnetic flux
   iv. Magnetic Flux density. Effect of field as applied to electromagnetism.

3. Relation of field in an ideal transformer.
4. Principle of induction.
   1. self induction
   2. mutual induction

   Difference between self induction and mutual induction

5. Colour codes used for winding of transformers.
6. Basic principles of a single phase, doubt wound transformer.

i. ii.

iii.

mutual inductance conservation of energy

operation of

2. Solve simple problems involving magnetic circuits.
3. Demonstrate the effect of an induced e.m.f by means of a galvanometer pointer. Discuss the relation of field in an ideal transformer.
4. Plot magnetic field due to current in:
   1. a long straightconductor
   2. a long solenoid

   iii. two parallel

   conductors.

5. Examine and discussthe single phase double wound transformer as approximate constant voltage device.
6. Examine the different colour codes used for the winding of transformers.

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transformers ”“ magnetic circuit (core)

iv. primary windings ”“ Turns ratio-cooling

7. Core lamination of a transformer.- Reasons
8. Types of losses intransformers.
   1. copper losses
   2. core losses

   (Eddy current and hysteresis losses)

9. Transformer Efficiency
10. Detailed construction of asimple single phase doublewound transformer.
11. 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

7. Examine and discuss the single-phase double wound transformer as approximate constant voltage device.
8. Examine the laminating of the core of a transformer.
9. discuss transformer Losses.
10. Calculation of transformer efficiency.
11. Construct a simple single phase double wound transformer.
12. Visit an electrical workshop and identify various types of transformers.

11.

Fluxes, Solders and Soldering
Explain principles of soldering and solder various electric and electronic connections.

1. Basic concepts of soldering
2. Types of ironsi. Soldering ii. Electric iii. Ordinary
3. Types of fluxes i. Composition ii. application
4. Sources of heat i. electric
   ii. battery
5. Cleaning of wire surfaces.

1. Introduction to different types of soldering.
2. Examine different types of iron
3. Examine different types of fluxes
4. demonstrate the use of electric or battery for soldering
5. Demonstrate cleaning of wire surfaces
6. Demonstrate soldering of wires with the use

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6. Soldering of wires
7. Cold solder joint and dry joint
8. Scrapping of wires
9. Methods of termination
   1. twisted loop termination
   2. claw type termination
   3. solder lugs
   4. shade and termination
   5. crimped end termination
10. Cable jointing.

of:

1. electric soldering iron
2. blow lamp

iii. plot and ladle

7. Discuss cold solderjoint and dry joint.
8. Demonstrate how wires are scrapped forsoldering.
9. Demonstrate different methods of wiretermination.
10. Demonstrate howcables are joined together.

12.

Electronic Signs and Symbols
Draw and interpret basic electronic/electrical signs and symbols.

1. Abbreviation in electrical/electronics circuits
2. Graphical symbols used in electrical/electronics systems.
   1. transistors
   2. amplifier

   iii. switch
   iv. socket outlet

1. Explain the meaning of abbreviation used in electrical circuits.
2. Display a chart showing Graphical symbols used in electrical/electronics systems

13.

Wiring and Connection of Electrical/Electronic Component

Wire different types of plugs and assemble components on a chassis

1. Types of plugs i. Mainsii.Coaxial iii.Phone
   iv. Jack plugs
2. Soldering and wiring of components to:
   i. tag boards
   ii. stripsiii. printed boardiv. vero-board.
3. Assembling of componentson a chassis

1. Examine different types of plugs.
2. Demonstrate howsoldering and wiring of components are being carried out.
3. Demonstrate how components are being assembled on chassis.