Hand-Crank Generator Model No. EM-8090
4®
Introduction
The Hand Crank Generator
(EM-8090) consists of a
permanent magnet DC motor
and is used for demonstrating
how manual work can be
applied to energy conversion.
The generator plugs into the
EM-8677 Series/Parallel
Circuit Board, allowing the
demonstration of both series
and parallel circuit pathways.
As a person cranks the handle
on the generator, mechanical energy is transferred to electrical energy
in the circuit and lights the bulb filament(s).
Suggested Activities
Equipment required: You will need the Hand-Crank Generator (EM-
8090) and a Series/Parallel Circuit Board (EM-8677) to perform the
following suggested activities.
Demonstrating the Electrical Path through a Series Circuit:
1. Connect the black lead to the COMMON port (ground) and the red
lead to the SERIES port of the Series/Parallel Circuit Board (EM-
8677).
2. Close Switch 1 (Move the switch handle down into the metal slot.)
Note: Keep Switch 2 open. Switch 2 is used for demonstrating parallel
circuits.
3. Rotate the Hand Crank Generator in the positive direction (shown
by the arrow on label of the generator) at approximately 1 to 2
revolutions per second. Both bulb filaments on the circuit board
will light. (Figure 2 on page 6 shows the electrical pathway.)
Turning
handle
Red (+)
lead
Generator Cover
Black (-)
lead
Figure 1: Hand-Crank Generator
WARNING: To avoid the
risk of shock or damaging
the generator, never
connect the Hand-Crank
Generator to another
power source, disassemble
the generator, use the
generator in or around
water, or try to repair the
generator yourself.
Always keep the plastic
covering over the
generator to protect the
leads from corrosion,
damage, etc. For
assistance with a faulty
generator, see Technical
Support in Appendix A and
the Warranty in Appendix
B.
Note: Rotating the handle
backwards generates a
negative voltage on the
red wire.
