高中物理變得簡單 - 電和磁（第 2 部分，共 2 部分）

This session will take eight (8) classes to complete. It will deal with the following:-

1.	Class 1 & 2 – Electromagnetism
2.	Class 3 & 4 – Electricity for Home and Society
3.	Class 5 & 6 – Electronic Devices
4.	Class 7 & 8 – Putting Electronics to work.

1.	Electromagnetism

a.	describe an experiment that demonstrates the existence of a force on a current carrying conductor placed in a magnetic field
b.	sketch the resulting magnetic flux pattern when a current-carrying wire is placed perpendicularly to a uniform magnetic field
c.	apply Fleming‘s left-hand (motor) rule to predict what will happen when current direction is perpendicular to a uniform magnetic field
d.	recall that the force on a current-carrying conductor placed perpendicular to a magnetic field depends on the strength of the field and on the magnitude of the current
e.	draw diagrams to show and explain the action of the following applications of electromagnetic force:
–	a simple d.c. motor
–	a moving-coil galvanometer
f.	describe simple experiments that demonstrate an induced e.m.f. caused by changing magnetic flux
g.	predict the direction of induced current, given the direction of motion of a conductor and the direction of a magnetic field
h.	describe simple experiments to show how the magnitude of the e.m.f. induced in a conductor depends on the rate of change of magnetic flux experienced by the conductor
i.	explain the action of the simple alternating current (a.c.) generator
j.	sketch graphs to represent the output from a simple a.c. generator draw a diagram of a transformer
k.	give a simple explanation of the principles of operation of a transformer
l.	describe the features of a transformer that make for efficiency
m.	recall that, for an ideal transformer, Pout = Pin
n.	describe experiments to show that, for an ideal transformer,
o.	recall and apply the transformer formulas to solve simple numerical problems
p.	recall the advantages of using alternating current for transmission of electrical energy


2.	Electricity for Home and Society

a.	describe the main methods of electricity generation in the Caribbean
b.	describe the distribution of electrical energy from the generating station to the consumer
c.	describe electrical circuits used in the home, and discuss reasons for using series, parallel and ring connections
d.	state the international insulation colour code used on wires carrying electricity in the home
e.	relate electrical safety to correct wire sizes, suitable fuses or circuit breakers and earthing
f.	state the adverse effects of connecting electrical appliances to incorrect or fluctuating voltage supplies
g.	perform calculations on the cost of electrical energy expressed in kilowatthours (kWh)
h.	draw a diagram of a dry cell and explain the functions of its various parts;
i.	state the difference between primary and secondary cells, and their relative advantages and disadvantages
j.	draw a circuit diagram to show how a secondary cell can be recharged
k.	identify conversions of electrical energy to other forms and vice versa
l.	discuss the importance of conserving electrical energy, and means of doing so


3.	Electronic Devices

a.	state what is meant by thermionic emission
b.	describe the functioning of a cathode-ray tube and uses to which cathode-ray tubes are put
c.	represent both direct current (d.c.) and alternating current (a.c.) on current–time or voltage–time graphs
d.	use current–time or voltage–time graphs to find the period and frequency of alternating currents or voltages
e.	describe a semiconductor in terms of charge carriers and resistance
f.	draw a current vs. voltage characteristic (graph) to show the behaviour of a p-n junction
g.	describe how a semiconductor diode can be used in half-wave rectification
h.	sketch voltage–time graphs to compare the variation of voltage with time before and after rectification
i.	distinguish between direct current from batteries and rectified alternating current by consideration of their voltage–time graphs
j.	devise a simple test to determine whether a semiconductor diode is defective
k.	describe the behaviour of semiconductor devices such as thermistors and light dependent resistors (LDRs)


4.	Putting Electronics to Work

a.	describe the functioning of mechanical and electronic switches
b.	recall the symbols for AND, OR, NOT, NAND and NOR logic gates
c.	state the function of each gate with the aid of truth tables
d.	draw and analyse simple electronic circuits (e.g. alarm circuits and motor control circuits)
e.	draw and analyse circuit applications involving combinations of not more than three logic gates
f.	discuss the impact of electronic and technological advances on society