Tech Support: Electric Circuits



Helpful Tips

  • Do not store the D-cells in the battery holders. Always remove D-cells from holders when not in use.
  • Remember: do not use more than two D-cells in series when lighting bulbs. If you use 3 D-cells in series, the bulbs will burn out very quickly, if not immediately.
  • Learning how electricity behaves is much easier, and more fun, if you use a digital multi-meter to make measurements of voltage, current, and resistance.
  • Every part in the Electric Circuits equipment module can be ordered separately, please click here for more details.
  • Batteries are not included. They must be purchased separately.
  • Good contact is made at any position on the post. It is not necessary to slide every wire to the bottom of the post.


Q: My students built a simple series circuit, and tried to apply Ohm's law, but the math doesn't seem to give the right answer. What's wrong?

A: If you have built a circuit that contains light bulbs, these components are "non-Ohmic". The resistance of a light bulb changes as it heats up and cools down. Ohm's law should only be applied when using the red, blue and green fixed resistors that come with the kit.

Q: Why don't the electric circuit kits include a digital multi-meter?

A: There are several reasons for this. First, we have found that many schools have a supply of digital multi-meters that they prefer to use with the electric circuits kit. Second, the digital multi-meters that you can use with this kit come in a wide variety of styles and prices. Third, you can perform qualitative electricity experiments without the digital multi-meters. For these reasons, the digital multi-meters are sold separately.

Q: Are the metal posts on the circuit board wired underneath?

A: No! Students must connect the metal posts with the wires provided in the kit when building circuits. This is so there is nothing "hidden" from the students.

Q: Do you have battery holders that can accommodate various battery sizes?

A: All of our investigations are designed using "D" batteries.

Q: Where can I order extra bulbs, wires and other components?

A: Extra components can be ordered by contacting customer service or your regional sales manager.

Q: Can the amount of electricity used in the Electric Circuits be dangerous?

A: No.