Help to understand basic series & parallel circuits?

Other Hardware General Electronics
1

Hello Guys!

So here are three examples of totally basic Electronic circles left series, middle series and right one parallel circuit.

What I don't get in my head is why the Parallel circuit is function well with those leds and are all same bright and also the current still is high that flows through?

But in the description it says that in the series circuit the current should be everywhere the same but why is the second led not working?

Sorry might be a really stupid question :see_no_evil:, but its like first time I have to do with electronic.
Any help or other resources to get this in my head, will be highly appreciated!

example
example1538×936 73.7 KB

2

You made a mistake of some sort. Not enough information.

3

Your battery is 3V.

The LED needs 2V to operate.

You have 2 (two) LEDs so you need 2V * 2 = 4V+ to get current flowing.

4V > 3V so the battery does not have enough voltage for two LEDs to light.

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4

But why it is working on the Parallel circuit? I can't get my head around it.
The left and middle one seems logic to me but the parallel isn't.

Thanks

5

Measure the voltage over one led in the parallel circuit. I bet it's more than 1.5 V.

6

In the right circuit, each LED requires 2v to operate.

You can think of it this way, you have 4 series circuits that share the same battery.

The battery is 3v, the battery feeds the parallel circuits with 3v each.

3v > 2v so there is enough voltage for each LED resistor combination to make that LED light.

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7

Thanks Larry that makes sense What if I wanted to calculate how long the LEDs would light with that battery, how would I go for it?

Might you could help

8

Google how long amp hour battery last.

Example

And

http://www.referencedesigner.com/cal/cal_54.php

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10

Thank you!

11

:+1:

12

The quick answer rule of thumb comes from the definitions:

Capacity = Current * Hours

rearrange:

Hours = Capacity / Current

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13

Thanks thats what I needed !

14

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