Current in a solenoid (electromagnetic relay) Current in a magnetic field (simple d.c. motor, moving-coil loudspeaker, moving-coil galvanometer) Conversion of a galvanometer to: an ammeter, a voltmeter, an ohmmeter Electromagnetic induction (induction coil) Simple a.c. generator (structure, principle) Principle of induction motor Transformers (factors affecting efficiency) Rectification—use of bridge rectifier Application of diodes (p-n diode as half wave rectifier, light-emitting diode (LED), photodiode) Basic structure of bi-polar transistor (its use as a voltage amplifier and a voltage inverter) Logic gates (AND,OR and NOT gates)
ACTIVITIES:
Demonstration of electromagnetic relay Demonstration of the principle on which the simple d.c. motor is based Demonstration of an induction coil Demonstration of a simple a.c. generator Demonstration of the principle on which the induction motor operates Use of bridge rectifier and capacitor to obtain smooth d.c. Demonstration of transistors as a voltage amplifier and voltage inverter Establish truth tables for AND,OR and NOT gates
SCIENCE,TECHNOLOGY AND SOCIETY:
Uses of electromagnetic relays Uses of motors and meters Uses of induction coils and induction motors Nicholas Callan Uses of generators and transformers Practical applications of smoothed rectified d.c. Uses of LEDs (optical displays) Uses of photodiodes (fibre optic receiver) Application of the transistor as a switch George Boole
