3B Scientific Small Electric Motor - Manual (Page 2)

3B SCIENTIFIC® PHYSICS
Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany • www.elwedidactic.com
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com
Subject to technical amendments.
Miniature electric motor 8691150
Instruction sheet
07/06 SP
1 Connecting lead
2 Acrylic housing
3 Motor
4 Fan
5 Base plate
6 Solar cell (not included)
1. Safety instructions
• Danger of injury! Maintain a safe distance from
the rotating components.
2. Description
The miniature electric motor is used to detect the
existence of extremely low voltages of little more
than 0.5 V. The low starting current facilitates the
detection of current flowing in systems with a small
electrode surface and a large distance between the
electrodes.
The electric motor is mounted inside a round
transparent acrylic housing on a base plate. A fan is
attached to it at the front.
3. Technical data
Operating voltage: max. 15 V
Initial voltage: 700 mV
Initial current: 10 mA
Internal resistance: 9
Ω
4. Sample experiments
4.1 Potential difference
• Connect two electrodes of different materials
(e.g. zinc and copper) to the electric motor.
• Insert the electrodes into some fruit juice that
possesses a high concentration of pure juice
(e.g. apple juice or lemon juice).
Once a favourable distance between the electrodes
has been attained, the electric motor starts run-
ning.
4.2 Conversion of light energy into electrical
energy
In order to conduct the experiment, the following
apparatus is additionally required:
1 Solar cell, 0.5 V, 200 mA 8461150
1 Multimeter, ESCOLA 10 8531160
Experiment leads
• Connect the motor to the solar cell.
• Connect the multimeter to the electrical cir-
cuit.
• Illuminate up the assembly with a bright light
source (e.g. sun, halogen lamp, etc.).
• Calculate the current or voltage.