8.
Locate fault of electronic devices by various methods i.e.
i. Testing individual components
ii. By signal flow method
iii. By measuring voltages at testing points
iv. Install and use P.A. system.
DETAILS OF ACTIVITIES (Class IX –XII)
Class IX
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Hand Tools :- their nomenclature and proper use.
eg: screw driver, cutter etc.
Distinguish between A.C. and D.C.-Identification of A.C. and D.C.
supply, simple experiment to measure A.C. voltage and current
through a coil.
Use of Multimeter (Analogue and Digital) to measure voltage
(A.C/D.C), current (A.C/D.C) and resistance.
Colour code for resistance and capacitors.
Study of electronic components-sign and symbols recognition,
specification and testing of components like resistors, capacitors
coil, diode, transistor, zener diode, photo diode, LED, solar cell,
P.C. Board, I.C. (Integrated circuits) using multimeter.
Working principle, use, specification and testing method for
microphone, loud speaker etc.
Soldering – Principle, method and materials.
Practice of soldering.
Assembling of extension board using 3-pin socket and fuse.
Safety precautions during electronic works – devices used for
personal safety, shock treatment. Rescue and first aid.
Significance of earthing in electronic circuits, recognition of live
and neutral wire.
Construction of 8 L.E.D. disco light (Draw circuit diagram)
Testing of disco light checking individual components.
Construction of battery eliminator. (using half wave/full wave circuit
diagram) (draw circuit diagram).
Testing of battery eliminator, checking individual components.
Simple construction of fire alarm (using photocell).
Class X
1.
Series and parallel connection of electronic components. Method of
connection, use, formulae [Practical- To connect atleast three
components in parallel/series and mixed group –measuring
voltages across each.
120