parallelresistorsseries
I know how to add resistors in parallel and resistors in series, but i don't understand how to differentiate between resistors in the format shown:
simulate this circuit – Schematic created using CircuitLab
I haven't been able to figure it out on my own and my lecturer hasn't helped either so i hope someone here is able to. Thanks.
Try re-drawing the schematic:
simulate this circuit – Schematic created using CircuitLab
Hopefully the solution will be obvious once you do so (comment/ask if it's not).
Your LEDs may or may not work exactly as you expect, depending on what you expect.
The change in brightness when operating the switch will vary depending on whether you have 1 or 9 LEDs lit. With 1 LED, the change will be small, with 9 LEDs, the change will be large.
With the switch closed, any number of LEDs will have the same brightness. With the switch open, as you turn on more LEDs, those already on will get less bright.
If you eliminate R8, and PWM the LEDs, you can achieve a constant brightness change regardless of the number of LEDs lit.
Best Answer
It often helps to re-draw the circuit in a way that makes more sense to you - it may take several tries to see the "real" circuit arrangement.
When I re-draw your circuit, the first thing I do is arrange it so that electricity flows from left to right, as God intended. :)
simulate this circuit – Schematic created using CircuitLab
Here we can see that R5 is simply between Vin and Ground, so has no effect on the rest of the circuit. R4 and R3 form a voltage divider, which feeds another voltage divider consisting of R2 and R1. If you had some values for the resistors and for Vin, it would be simple to calculate Vout.