Page 546 - SUBSEC October 2017_Neat
P. 546
UNIT 2
MODULE 1: ELECTRICITY AND MAGNETISM (cont’d)
SPECIFIC OBJECTIVES EXPLANATORY NOTES SUGGESTED PRACTICAL
ACTIVITIES
Capacitors (cont’d)
Students should be able to:
4.7. recall the equations for Q = Q exp ( −t )
capacitor charge and 0 RC
−
discharge; = (1 − ( ))
0
−t
I = I exp ( )
0
RC
−
= (1 − ( ))
0
−t
V = V exp ( )
0
RC
−
= (1 − ( ))
0
(RC is the “time constant”
and measured in seconds.)
4.8. use the equations for
capacitor charge and
discharge; and,
4.9. sketch graphs illustrating the Q, V or I against t.
charge and discharge of a
capacitor.
5. Magnetic Fields
Students should be able to:
5.1. explain ‘magnetic flux
density’ and the ‘tesla’;
5.2. sketch magnetic flux
patterns due to a long
straight wire, a flat circular
coil and a long solenoid; and,
CXC A16/U2/17 46
