Page 3 - PRE-U STPM PHYSICS TERM 2

CHAPTER
13 CAPACITORS

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Concept Map

Capacitors
Dielectric

Parallel-Plate Capacitor d
Capacitance
ε ε ε A
0 0
C =
ε
ε
Q C C = +Q –Q εε A
C
C
C = — d C = r 0 0
= —
= —
= —
V V d
V
Energy Stored in Charging a Capacitor
Capacitor t t t
– —–
– —–
– —–
– —–
– —–
– —–
=
Q
V
V
I
Q
E
(1 – e
E
I
=
=
CR
CR
CR
CR
CR
CR
1 (a) V = E(1 – e – —– ) (b) Q = Q (1 – e – —– ) (c) I = I e – —–
0
0
=
CV

U = CV 2 2
U U
CV
2 V Q I
1
= QV E Q 0 I 0
2
1 Q Q Q 2 2
=
2 V
0 t 0 t 0 t

Discharging a Capacitor
– —–
– —–
– —–
– —–
– —–
– —–
V
=
(c)
=
(a) V = V e – —– t (b) Q = Q e – —– t (c) I = I e – —– t
I
V
I
Q
=
(b)
Q
CR
CR
CR
CR
CR
CR
CR
CR
CR
CR
0 0 0
V Q I
V 0 Q 0 I 0
0 t 0 t 0 t
Bilingual Keywords
Capacitance: Kapasitans Discharging: Menyahcas
Capacitor: Kapasitor Energy stored: Tenaga disimpan
Charging: Mengecas In parallel: Selari
Concentric sphere: Sfera-sfera sepusat In series: Sesiri
Dielectrics: Dielektrik Parallel-plate: Plat selari
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13 Physic T2.indd 43 10/18/18 3:18 PM