Title: Facilitator Help Page: Lab 7-4 -- (Do Not Publish)
Course: Basic Electrical Theory and Wiring (Sandbox) > Section: Module 7: Ohm's Law

Answers and Tips

1. The voltage drop across the relay should be around 24V. If it is much higher or lower, you can adjust the voltage with a screw driver to be around 24V.
2. The current varies a lot here. Typically, I see around 50 mA. When the students measure the current in and out, it will be different. They will get better results if they do not have a negative number.
3. \(R\:=\frac{\:V}{I}=\frac{\:24}{.050}=\:480\:Ω\)
  1. This varies again based on current measurement.
4. The relay coil should be off and the wires should be removed before taking a measurement. The value should be around 465 to 512, depending upon the coil.
5. They need to explain whether or not Ohm's Law worked here or not. I want some detail as to why or why not, not just a yes.
6. They should be using a brown wire for the 24V and a blue wire for the 0V or common.
7. The rest of the questions are reminders for safety.

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