Comment "On rectifiers and diodes"

Thread Starter

C H Cooke

Joined Sep 15, 2011
1
A diode may be thought of as like a switch: “closed” when forward-biased and “open” when reverse-biased.

I disagree with with this statement-when forward biased, electrons flow
through the diode-granted opposite to the conventional current flow
direction. When reverse biased this current is not allowed

So why say the switch is closed when forward biased? Your picture shows the light coming on
when forward biased,and staying off when when reverse biased. So it would again appear that
forward biased is the "open" switch.
 
Last edited:

MrChips

Joined Oct 2, 2009
30,464
A diode may be thought of as like a switch: “closed” when forward-biased and “open” when reverse-biased.

So it would again appear that
forward biased is the "open" switch.
What you say makes no sense. Can you elaborate on why you think that forward bias is the "open" switch?
 

Adjuster

Joined Dec 26, 2010
2,148
This is simply a problem of definition: a long-established convention that the original poster may not be aware of.

In normal usage in technical English, an open switch passes no current (think open-circuit). A closed switch can pass current.

Thinking of an old-fashioned knife switch may help to reinforce the idea. The switch is off when the gap is open, on when the gap is closed.
 
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colinb

Joined Jun 15, 2011
351
open vs. closed - if you end up combining electrical relay controls with fluid control systems, it gets really ugly. It's frustrating that for electrical circuits, “closed” means current can flow but for fluid valves, “closed” means there is no flow.
 

shortbus

Joined Sep 30, 2009
10,044
open vs. closed - if you end up combining electrical relay controls with fluid control systems, it gets really ugly. It's frustrating that for electrical circuits, “closed” means current can flow but for fluid valves, “closed” means there is no flow.
Especially when they use water pipes as an analogy of electric flow.:)
 
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