Do you want to give the gift of learning this year?

Below you can gift a one-year membership for Ohmify, including a starter’s component kit, to a loved one.

Ohmify consists of more than 20 electronics courses, with access to a community forum to get help with any topic or project.

It is made for people with little or no electronics understanding who want to be able to confidently create electronic gadgets and tools – and who are prepared to take action to make it happen.

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I’m going to show you what negative voltage is by putting John into a hole. As you’ll quickly learn, it’s nothing weird or mystical.

Meet John. He is 1.8 meters (6 feet) tall.

What does it mean that John is 1.8 m tall? Could you find his height by only looking at his head?

No. You have to compare the top of his head to the ground he is standing on to be able to find his height. That John is 1.8 m tall really means that the top of his head is 1.8 m higher than the ground that he stands on.

It’s the same thing with voltage. You can’t say anything about the voltage without comparing it to another point.

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