ESAB Powercut 1600 Service Manual page 167

SECTION 9
10.4 Glossary
SYMBOL NOTATION
A
V
R
W
F
n

+
-
C n
+
C n
or R n
F n
SW n
- +
D n
D n
D n
SCR
L n
L n
T n
NAME VALUES
Amperage n Current: effectively the "amount of flow" of electricity.
Volts n Electromotive force: effectively the "pressure" of electron movement.
Resistance n Opposition to electron transfer: expressed in OHMS.
Watt n A measure of Power. Watts = V*A
Farad n Amount of electrical storage in a capacitor.
A voltage used to control or stabilize an electronic circuit. A forward bias
is voltage applied in the direction of the current flow within a transistor,
BIAS
tube or circuit. A reverse bias is voltage applied in the opposite
direction.
OCV n VOLTS Open Circuit Voltage:
Number Indicates that any number may be used in its place.
micro 0.00000n One Millionth of any unit.
ANODE: + Positive element of device.
CATHODE: - Negative element of device - the banded end of a diode.
Stores energy in the electrostatic field generated between two metal
CAPACITOR F
plates separated by an insulator. Typical values are in F.

Electrolitic capacitors will be damaged if polarity is not correct. Capaci-
ELECTROLITIC
tors can charge themselves from ambient electric fields and should be
F

CAPACITOR
handled with caution.
Component that opposes current flow proportionately to its Ohm ()
 , W
RESISTOR
rating. Power dissapation is expressed in Watts ().
Device in series with a load which opens the circuit if its current
FUSE n A, n V
rating (A) is exceeded.
n A, n V
SWITCH Device which opens and closes a circuit.
n P, n T
DIODE A semi-conductor that conducts in only one direction
A diode that permits high current flow without damage, the reverse
voltage remains almost constant over a wide range of currents, used
ZENER DIODE
esp. to regulate voltage.
LIGHT EMITTING
Semiconductor diode that emits light when conducting current
DIODE
Device having primary and secondary inductors for altering a-c signal
SILICON
amplitudes, impedance matching,and isolation purposes. . A reverse
CONTROLLED
RECTIFIER blocking triode thyristor
Wound wire device; current through the coil generates a electro-
magnetic field causing inductive reactance, which increases with
COIL
number of turns and density.
Adding a core to a coil increases the inductance produced.
COIL (Iron Core)
Wound wire device with a primary and secondary coil(s) which increases
or decreases voltage applied to the primary based on coil and core
TRANSFORMER
configuration. 1:1 transformers are used for isolation.
Identifies the earth (ground) connection. NOTE: Not for a protective
GROUND earth connection.
gENERAl INfORMATION
DESCRIPTION
167

10