Useful Formulas and Information

USEFUL FORMULAS AND INFORMATION
E = IR
R = E/I
I = E/R
P = EI
P = E2/R
P = I2R
RESISTORSCAPACITORSCOILSDELAY LINES
ENERGY CONVERSION
OHM’S LAW
J = Pt
J* = CE2
2
E = Voltage (Volts)
R = Resistance (Ohms)
I = Current (Amperes)
P = Power (Watts)
J = Energy = Watt-seconds = Joules
C = Capacitance (Farads)
t = Time (Seconds)
E = Voltage (Volts)
P = Power (Watts)
*Capacitor discharge circuit
ELECTRICAL CHARACTERISTICS
RESISTORS IN SERIES
Quality
RS= R1 + R2 + R3...+Rn
Current
Charge
Power
Voltage
Resistance
Reactance
Impedance
Conductance
Capacitance
Inductance
Frequency
Period
RESISTORS IN PARALLEL
RP =
1
1/R1 + 1/R2 + 1/R3...+1/Rn
TEMPERATURE CONVERSION
TC = 5/9 (TF -32°)
TF = 9/5 (TC ) +32°
Symbol
I
Q
P
V
R
X
Z
G
C
L
f
t
Basic unit
Ampere (A)
Coulomb (C)
Watt (W)
Volt (V)
Ohm (Ω)
Ohm (Ω)
Ohm (Ω)
Siemens (S)
Farad (F)
Henry (H)
Hertz (Hz)
Second (S)
PPM CONVERSION
1ppm10ppm25ppm50ppm100ppm1000ppm10,000ppm
.0001%
.001%
.0025%
.005%
.01% 0.1%
1%
Value MULTIPLES & SUBMULTIPLES OF UNITS
Prefix
1,000,000,000,000 = 10
1,000,000,000 = 109
1,000,000 = 106
1,000 = 103
0.1 = 10-1
0.01 = 10-2
0.001 = 10-3
0.000 001 = 10-6
0.000 000 001 = 10-9
0.000 000 000 001 = 10-12
12
Symbol
Example
teraTTΩ = 1012Ω
gigaGGΩ = 109Ω
mega
M
MΩ = 106Ω
kilo
K
KV = 103V
deci
d
dm = 10-1m
centi
c
cm = 10-2m
milli
m
mA = 10-3A
-6
micro
µ*
µV = 10 V
nano
n
ns = 10-9s
pico
p
pF = 10-12F
* “M” is often used to designate “µ” (micro)
GENERAL NOTES
OVER/UNDER SHIPMENT POLICY
RCD reserves the right to ship ±3% (or 1 piece, whichever is greater) of the quantity ordered (±6% on SWIFTTM orders). Please
order accordingly.
90-DAY NO HASSLE RETURN POLICY
Standard stock items can be returned for any reason less a 30% restocking charge ($25 minimum) as long as the goods are packaged in the original RCD containers and remain in “new” condition (material discrepancies resulting from RCD’s error are returnable
for full credit). The maximum returnable quantity must not exceed RCD’s normal stock level. All returns require a Return Material
Authorization (RMA) number. Shipping charges are to be paid by customer.
CUSTOM MADE ORDERS POLICY
All non-stock items are manufactured on a NCNR (no cancellation, no return) basis for each particular customer’s requirement. The
customer is liable for full costs applicable at the time of any changes.
SALES TERMS
All orders are subject to RCD’s Terms and Conditions as detailed in Form GF061. All specifications are subject to change without
notice.
RCD Components Inc, 520 E.Industrial Park Dr, Manchester, NH, USA 03109 rcdcomponents.com Tel: 603-669-0054 Fax: 603-669-5455 Email:sales@rcdcomponents.
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