參數(shù)資料
型號： SR151A470JTA
英文描述： KONDENSATOR RADIAL 47PF 100V 5ST
中文描述： KONDENSATOR徑向47PF 100V的5ST
文件頁數(shù)： 11/72頁
文件大?。?/td> 1107K
代理商： SR151A470JTA
9
BASIC CAPACITOR FORMULAS
I. Capacitance (farads)
English: C =.224 K A
T
D
Metric: C =
.0884 K A
T
D
II. Energy stored in capacitors (Joules, watt - sec)
E =
1
2
CV
2
III. Linear charge of a capacitor (Amperes)
dV
dt
I = C
IV. Total Impedance of a capacitor (ohms)
Z = R
V. Capacitive Reactance (ohms)
1
2
π
fC
2
S
+ (XC- XL)
2
xc=
VI. Inductive Reactance (ohms)
x
L
= 2
π
fL
VII. Phase Angles:
Ideal Capacitors: Current leads voltage 90°
Ideal Inductors: Current lags voltage 90°
Ideal Resistors: Current in phase with voltage
VIII. Dissipation Factor (%)
D.F.= tan
d
(loss angle) =E.S.R. = (2
π
fC) (E.S.R.)
Xc
IX. Power Factor (%)
P.F. = Sine
d
(loss angle) = Cos
f
(phase angle)
P.F. = (when less than 10%) = DF
X. Quality Factor (dimensionless)
Q = Cotan
d
(loss angle) =
1
D.F.
XI. Equivalent Series Resistance (ohms)
E.S.R. = (D.F.) (Xc) = (D.F.) / (2
π
fC)
XII. Power Loss (watts)
Power Loss = (2
π
fCV
2
) (D.F.)
XIII. KVA (Kilowatts)
KVA = 2
π
fCV
2
x 10
-3
XIV. Temperature Characteristic (ppm/°C)
Ct – C
25
C
25
(T
t
– 25)
T.C. =
x 10
6
XV. Cap Drift (%)
C.D. =
C
1
– C
2
C
1
x 100
XVI. Reliability of Ceramic Capacitors
L
0
=
V
t
X
T
t
Y
L
t
(
V
o
)
XVII. Capacitors in Series (current the same)
Any Number:
1 = 1 + 1 --- 1
CT
C
1
C
2
Two: CT=
C
1
+ C
2
(
T
o
)
C
1
C
2
CN
XVIII. Capacitors in Parallel (voltage the same)
CT= C
1
+ C
2
--- + CN
XIX. Aging Rate
A.R. = %
D
C/decade of time
XX. Decibels
db = 20 logV
1
V
2
The Capacitor
Pico
Nano
Micro
Milli
Deci
Deca
Kilo
Mega
Giga
Tera
X 10
-12
X 10
-9
X 10
-6
X 10
-3
X 10
-1
X 10
+1
X 10
+3
X 10
+6
X 10
+9
X 10
+12
K
= Dielectric Constant
f
= frequency
L
t
= Test life
A
= Area
L
= Inductance
V
t
= Test voltage
T
D
= Dielectric thickness
d
= Loss angle
V
o
= Operating voltage
V
= Voltage
f
= Phase angle
T
t
= Test temperature
t
= time
X & Y
= exponent effect of voltage and temp.
T
o
= Operating temperature
Rs
= Series Resistance
L
o
= Operating life
METRIC PREFIXES SYMBOLS
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