Are you struggling to understand circuits and see how currents flow?
I wrote this based on an interaction I had with Gary.
And maybe it can help you.
I was developing some new material for a course.
And I used Gary as my test subject. He’s an adult British gentleman with no electronics background whatsoever.
He told me that if he could understand this, then anyone could.
We sent a lot of emails back and forth.
He had trouble understanding it. So he asked me:
“I’m looking at the circuit you sent, but I am struggling to see the loop from plus to minus – could you draw it out for me?”
So I started drawing.
And it became very complicated.
Arrows were pointing in all directions.
Loops with sub-loops.
And three new drawings for the other states when the loops had changed into a different loop.
I took a step back and looked at the drawings.
“This is not going to help him one bit!” I thought to myself.
Then it occurred to me – he’s looking for the wrong thing!
I never look for loops when I try to understand how a circuit works.
I look for voltages.
And to find how the current flows in a circuit, I use this rule:
Current always flows from a higher voltage to a lower voltage – if there is a path for the current to take.
With this rule, I don’t have to look at the current in the whole circuit to understand it.
I can look at a small part, figure out the voltages, then see how the current flows in that part of the circuit.
And if voltages between two points should change – which they sometimes do – then I can also see how that change affects my circuit.
That’s so much easier!
With practice, you get better and better at spotting higher and lower voltage points – and this way your circuit quickly makes sense.
If you’re ready to start building and understanding electronics from scratch – an Ohmify membership might just be for you.
You’ll get access to a library of courses and projects that will teach you electronics and have you build robots, kitchen timers, music players, and more.
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