Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
To do this in your head:
voltage at a = voltage at b
you have 3 x 680R in series with a 340R
If you make 340R equal to 1 unit of resistance, you have 3 x 2 units plus 1 unit = 7 units
This means you have 10v divided by 7 units = 10/7 volt per unit = 1.42volts at point a and b
If a and b are different, you work out the parallel combination of the two and divide the whole series resistance of the chain into the voltage and then multiply the result by the lower resistance.
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