Order No. 174
Three-phase alternating-current (AC) generator

- when the rotor turns, three different and phase-displaced AC voltages are produced. These voltages correspond with the colours of the electromagnets
- the sinusoidal oscillation is at its positive maximum when the rotor's North Pole reaches the electromagnets, and at its negative maximum when the rotor's South Pole reachs the electromagnet
   

Order No. 167
Charging a battery

- discharged battery; charging procedure; charged battery; discharging the battery
- generator or consuming device can put into the electric circuit

- all chemical procedures can be shown by moving molecules and atoms

Order No. 262
Sliding-armature starter motor

Functions:
- operating the starter switch
- pulling the tumbler switch to one side

Parked position:
- selecting the first shifting stage
- displacement of the entire armature
- the catch is released by the armature

Engaging the pinion
- selecting stage 2 by means of the tumbler switch
- function of the retracting spring

Order No. 312
Sliding-gear starter motor

- at rest position
- actuating the starter switch
- actuating the solenoid switch

- closing the bypass windings
- function of the tumbler bridge
- engaging the pinion

- lifting the catch using the release lever
- connecting the bypass windings

Order No. 142
Starter motor
(pre-engaged drive starter with planetary gear by BOSCH)

- starter switch can be moved, the solenoid switch is closed
- activating the excitation winding, engaging the pinion
- function of the spring when tooth touches tooth
   

Order No. 450
Solenoid Switch of pre-engaged starter motor

- Function of pull-in and holding winding
- Pulling of the armature when current flows
 

- Closing the contacts by the contact bridge
- Function and interaction of the springs

Order No. 140
Centrifugal advance device of a distributor

- function of the centrifugal weights
- function of the retracting spring
- ignition advance caused by centrifugal weights acting on the contact-breaker cam
    

Order No. 184
Pulse generation

(made-up of two models)
a) induction-type pulse generator
b) hall-effect pulse generator
The oscilloscope display for the pulse generation is produced by turning the rotor or the rotor with shutter blades.

Order No. 138
Ignition distributor

- opening and dwell angle can be read
- change of the breaker-point gap
- opening and dwell angle change depending on the breaker-point gap

Order No. 139
Vacuum advance at an ignition distributor

- rotating of the contact-breaker plate by the vacuum box
- ignition advance
- the ignition interval can be changed - there are cams for four and six cylinders 

Order No. 230
Ignition distributor with advanced and retarded ignition

- in addition, the functions of advanced and retarded ignition can be shown and the interaction of both ignition-timing systems can be seen
(All parts can be moved and are equipped with real steel springs and diaphragms).
   

Order No. 330
Magneto ignition

    - function of the contact breaker
- function of the pole wheel with permanent magnets
- magnetic field layout
- high-voltage generation
- function of the condenser

Order No. 273
Relay I

    the following can be shown:
- difference between normally closed contacts (NCC) and normally opened contacts (NOC)
- function of the NCC and NOC relay
- motion of the circuit armature is shown on relay model
- motion of the circuit armature in the electric diagram
  

Order No. 274
Relay II

Functions:
- motion of the circuit armature is shown on relay model
- motion of the control switch in the electric diagram
    

- motion of the circuit armature in the electric diagram
- selecting different electric circuits

Order No. 341
Relay III

When the switch is actuated the jumper is drawn to the solenoid coil by means of a transparent cam plate. Simultaneously, the jumper switches ...

... the contacts of electric circuit 2-1 over to circuit 2-3.

Order No. 357
Reed contact relay

- function of the ferric magnets
- function of the magnet coils
- opening and closing of the reed contacts
- application of the reed contacts and of the reed relay in automotive engineering
    

Order No. 300
Latching relay

- pulling the circuit armature
- actuating the rocker switch
- rocker switch in contact positions

- switching to full beam or dipped headlights

Order No. 333
Impact horn

- magnetic field layout
- armature stroke against iron coil core
- resonator movement
- CI interruption and connection of the electric circuit
- function of the leaf spring
   

Order No. 344
Digital Measuring Unit I

- method of functioning of a digital measuring unit
- control via a 7-character binary word
- formation of the numbers 0-9 and some letters ...

... (by the simple sliding of the windows of controlled segment and of the binary numbers in the field of vision)

Order No. 345
Digital Measuring Unit II

Conversion of the  binary number at the input of the decoder into a decimal number on the display. Control of the one-character seven-segment display via the constant memory (by moving the field of vision and sliding the illuminated window of the controlled segments).
   

Order No. 340
Overload release

- power flow in overload release
- release caused by overload
- thermal release

- manual release
- power flow recovery after release

Order No. 241
Parallel connection of resistors

Flow of current and voltage when using a parallel connection of resistors can be shown by means of three voltmeters and three ammeters.
         

Order No. 242
Series connection of resistors

Flow of current and voltage when using a series connection of resistors can be shown by means of three voltmeters and three ammeters.

Order No. 452
Stepper motor

- Mode of effect of a stepper motor
- Polarity reversal of windings 1 and 2

- Change of the poles of the magnetic fields
- Movement of the impeller
(steps turning left or right)

Order No. 336
Throttle switch

- closing of the idle contact with idling position and trailing throttle
- closing of the full-load contact with full-load operation
   

  
- opening of the idle contact and of the full-load contact with part load operation

Order No. 444
Idle-speed control

- Task of the rotary actuator
- Function of the rotary valve
- Normal function, emergency operation function

Order No. 453
Altitude sensor

With the help of a lever on which there is a cam, the
altitude capsule can be spread and one sees how the
red lever is moved and the sensing on the resistance
path of the potentiometer is displaced. The altitude
sensor reports the alteration in air pressure compared
with the loading pressure regulation to the control
device and leads to a correction of the amount injected.
 

Order No. 443
Auxiliary bypass valve

- The additional air slide as a bypass
- Function of the bimetal

If the engine speed is too low, the cross-section is reduced, the output rotor turns more quickly.

Order No. 427
Transistor

The base is actuated by closing the switch. The collector emitter line becomes conductive, the lamp lights up. This can be shown clearly with the help of the water analogy. When the small flow of water ...
  

... reaches the base, this flow of water opens the slide and makes the way free for the large water flow (collector emitter line), the water can flow.

Order No. 441
Potentiometer

- Mode of effect of a potentiometer
- Wiring diagram of a potentiometer

- Function of the sliding contact
- Function as a power divider

Order No. 313
Electric Circuit (DC)

The model shows how the generator (electron pump) actuates the electrons in the wire. In the electric bulb the electrons are slowed down (line restriction). Thus friction heat and light are produced.
Simulation:
- DC: The electrons move in one direction only
- AC: The electrons are moved back and forth

Order No. 162
Commutator

- principle of a direct-current (DC) motor and a commutator
- the magnetic field turns with the electromagnet; after 180 degrees, the current direction changes