EE281-Electric Circuits

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# EE-281 ELECTRIC CIRCUITS

## Ozan Keysan

[ozan.keysan.me](http://ozan.keysan.me)

Office: C-113 <span class="meta">•</span> Tel: 210 7586

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# Connection of Voltage Sources

## Series Voltage: \\(V_{tot}=V_1 + V_2\\)

![](series_V.png)

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# Connection of Voltage Sources

## !! Parallel Voltage: If \\(V_{1} \neq V_2\\)

![](parallel_V.png)

[lithium battery fire](http://www.youtube.com/watch?v=HCGtRgBUHX8)

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# Connection of Current Sources

## Parallel Current: \\( I_{tot} = I_1 + I_2 \\)

![](parallel_I.png)

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# Connection of Current Sources

## !! Series Current: If \\(I_{1} \neq I_2\\)

![](series_I.png)

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# Passive Sign Convention

## Resistors cannot produce power, only consumes it !

![](https://upload.wikimedia.org/wikipedia/commons/thumb/1/18/Passive_sign_convention.svg/300px-Passive_sign_convention.svg.png)

### ! Current enters from the positive voltage terminal

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# Power

## \\(Power = Voltage \times Current \\)
## \\(P = VI\\)

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## \\(P = I^2 R\quad\\)    or   \\(\quad P = \dfrac{V^2}{R}\\)
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## Resistors cannot produce power:
##Absorbed Power for a Resistor > 0
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# Short Circuit

## Resistance = 0 ==> Voltage difference = 0

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# Open Circuit

## Resistance = \\(\infty\\) ==> Current = 0

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# Examples
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# Any questions?

## You can download this presentation from: [keysan.me/ee281](http://keysan.me/ee281)