DTM7000
12
Doc.: 00293978-v1
The transistor does not allow current to flow (blocked)
The transistor allows current to flow
Consumers
These are components which consume current. There are two
types of consumer, Active & Passive.
Passive Consumers:
bulbs, resistors, etc.
Active Consumers:
motors, injectors, retarding valves, etc.
Attention, certain consumers are polarized, whereas others are not.
The notion of Watts Consumed is important when dealing with
consumers, as, for a given voltage one can determine the
absorbed current.
Example of the various modules along with their consumers:
Relays
A relay is made up of two parts, the control circuit and the power circuit.
The control circuit:
You provide a supply of a few milliamps to a coil, which will create a magnetic field.
The power circuit:
The magnetic field created by the control circuit is used to open and close the power circuit, which may
have a current flow of around 10 A.
Within a relay, the control circuit is
isolated
from the power circuit.
B
C
E
+
L.E.D.
+
B
C
E
+
L.E.D.
+
