Elenco Upgrade Kit SC500 to SC750 - Manual (Page 70)

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Project #658
OBJECTIVE: To learn about the electromagnet.
Two-Lamp
Electromagnet Delayer
Build the circuit and turn it on. First the 2.5V lamp (L1) turns on, and
then the 6V lamp (L2) turns on. Both may be dim, replace your
batteries if they do not light at all.
The electromagnet (M3) stores energy, and the batteries must fill it up
before the lamps become bright. The smaller bulb turns on sooner
because it needs less current to light.
Project #659
OBJECTIVE: To measure the electromagnet current.
Electromagnet
Current
Use the HIGH (or 1A) setting on the meter (M2) to measure the
electromagnet (M3) current. Compare the meter reading to that for the
motor and lamp current in projects #544-546. Insert the iron core rod
into the electromagnet and see if it changes the meter reading.
To learn more about how circuits work, visit www.snapcircuits.net or page 85 to find out about our Student Guides.