dynamo query

"Rob Morley" wrote in message
news:20091006172749.6f246689@bluemoon...
On 06 Oct 2009 16:48:18 +0100 (BST)
David Damerell wrote:

Quoting al Mossah :
My hub dynamo also generates DC (come to think of it, isn't that a
definition of a dynamo, as opposed to an alternator?)

Context is everything. A device on a bike that makes electricity
from
motion is a "dynamo", AC or DC.

No, it's a generator. Whether it's more specifically a dynamo or an
alternator depends on whether it has a commutator. I don't think
there
has been a good reason to use a commutator since cheap and reliable
solid state rectifiers became available many years ago.


Diode voltage drop?

Really depends on application - commutator is better in heavy power
applications, and with certain configurations of winding and
commutator assembly, can give MUCH smoother DC.

"Alan Braggins" wrote in message
...
In article 20091006172749.6f246689@bluemoon, Rob Morley wrote:
David Damerell wrote:
Quoting al Mossah :
My hub dynamo also generates DC (come to think of it, isn't that
a
definition of a dynamo, as opposed to an alternator?)

Context is everything. A device on a bike that makes electricity
from
motion is a "dynamo", AC or DC.

No, it's a generator. Whether it's more specifically a dynamo or an
alternator depends on whether it has a commutator.

No. Normal usage is that bicycle generators are called dynamos, even
though this doesn't follow usage in other contexts.

Where "Normal" means "Popularly used but technically incorrect". Same
idea as people calling lamps "light bulbs". They are not bulbs.
Bulbs GROW, lamps GLOW. But we all know what we mean.....

http://en.wikipedia.org/wiki/Bicycle...Dynamo_systems
http://en.wikipedia.org/wiki/Dynamo
http://en.wikipedia.org/wiki/Hub_dynamo

On Wed, 7 Oct 2009 07:26:12 +0100, Ian wrote:

"Alan Braggins" wrote in message

No. Normal usage is that bicycle generators are called dynamos, even
though this doesn't follow usage in other contexts.

Where "Normal" means "Popularly used but technically incorrect".

Where normal means 'as customarily done', yes. That's the normal
definition of normal, I believe.

Tell me, do you drive an motorised omnibus vehicle, or is it just a
bus?

regards, Ian SMith
--
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Ian wrote:


Where "Normal" means "Popularly used but technically incorrect". Same
idea as people calling lamps "light bulbs". They are not bulbs.
Bulbs GROW, lamps GLOW. But we all know what we mean.....


What, like the 'electrical plug on the wall'?

(Arrgh! )


--
Its never too late to reinvent the bicycle

Ian wrote:


Where "Normal" means "Popularly used but technically incorrect". Same
idea as people calling lamps "light bulbs". They are not bulbs.
Bulbs GROW, lamps GLOW. But we all know what we mean.....

Oh, that gives me some unexpected nostalgia. When I was in junior school
the headmaster would pop into class occasionally to give us one of his
two pieces of wisdom. the first was something about longboats and
Vikings that I have forgotten, but the other was a strict rule about the
word 'bulb'. I hadn't met anyone who was not from that school who cared
at all about it until now. However much I explained it to them.


--
Roger Thorpe

....Wait a minute, It's stopped raining/
Guys are swimming, guys are sailing.....

"Ian Smith" wrote in message
. ..
On Wed, 7 Oct 2009 07:26:12 +0100, Ian wrote:

"Alan Braggins" wrote in message

No. Normal usage is that bicycle generators are called dynamos,
even
though this doesn't follow usage in other contexts.

Where "Normal" means "Popularly used but technically incorrect".

Where normal means 'as customarily done', yes. That's the normal
definition of normal, I believe.

Tell me, do you drive an motorised omnibus vehicle, or is it just a
bus?

Neither now.

(

On Wed, 07 Oct 2009 10:12:22 +0100, Roger Thorpe
wrote:

Ian wrote:


Where "Normal" means "Popularly used but technically incorrect". Same
idea as people calling lamps "light bulbs". They are not bulbs.
Bulbs GROW, lamps GLOW. But we all know what we mean.....

Oh, that gives me some unexpected nostalgia. When I was in junior school
the headmaster would pop into class occasionally to give us one of his
two pieces of wisdom. the first was something about longboats and
Vikings that I have forgotten, but the other was a strict rule about the
word 'bulb'. I hadn't met anyone who was not from that school who cared
at all about it until now. However much I explained it to them.

And you're surprised by this?

TBH I have no understanding of why anyone would want to insist on such
stupid and arbitrary distinctions. The electric things have been known
to most people as light bulbs for 100 years or more, so it's an
absolutely correct usage of the term now.

Ace wrote:
On Wed, 07 Oct 2009 10:12:22 +0100, Roger Thorpe
wrote:

Ian wrote:

Where "Normal" means "Popularly used but technically incorrect". Same
idea as people calling lamps "light bulbs". They are not bulbs.
Bulbs GROW, lamps GLOW. But we all know what we mean.....
Oh, that gives me some unexpected nostalgia. When I was in junior school
the headmaster would pop into class occasionally to give us one of his
two pieces of wisdom. the first was something about longboats and
Vikings that I have forgotten, but the other was a strict rule about the
word 'bulb'. I hadn't met anyone who was not from that school who cared
at all about it until now. However much I explained it to them.

And you're surprised by this?

TBH I have no understanding of why anyone would want to insist on such
stupid and arbitrary distinctions. The electric things have been known
to most people as light bulbs for 100 years or more, so it's an
absolutely correct usage of the term now.

But when you're 8 years old 'Some things [that you're taught] just stick
in your mind' even though decades later you know that it doesn't matter.
For a similar reason I always pause before using the word 'nice' (it was
forbidden).
I rather wish that I'd remembered the thing about the Vikings though, it
must have been more interesting.

--
Roger Thorpe

....Wait a minute, It's stopped raining/
Guys are swimming, guys are sailing.....

On Wed, 07 Oct 2009 12:05:55 +0100, Roger Thorpe
wrote:

Ace wrote:
On Wed, 07 Oct 2009 10:12:22 +0100, Roger Thorpe
wrote:

Ian wrote:

Where "Normal" means "Popularly used but technically incorrect". Same
idea as people calling lamps "light bulbs". They are not bulbs.
Bulbs GROW, lamps GLOW. But we all know what we mean.....
Oh, that gives me some unexpected nostalgia. When I was in junior school
the headmaster would pop into class occasionally to give us one of his
two pieces of wisdom. the first was something about longboats and
Vikings that I have forgotten, but the other was a strict rule about the
word 'bulb'. I hadn't met anyone who was not from that school who cared
at all about it until now. However much I explained it to them.

And you're surprised by this?

TBH I have no understanding of why anyone would want to insist on such
stupid and arbitrary distinctions. The electric things have been known
to most people as light bulbs for 100 years or more, so it's an
absolutely correct usage of the term now.

But when you're 8 years old 'Some things [that you're taught] just stick
in your mind' even though decades later you know that it doesn't matter.

Sure. Our English teachers always told us not to use the word 'get',
so it took me many years to accept that my usage thereof was in no way
incorrect. I think it was considered 'lazy' as there would always be a
more precise verb. Or some such ********.

For a similar reason I always pause before using the word 'nice' (it was
forbidden).

That's a strange one. Was there a reason given?

I rather wish that I'd remembered the thing about the Vikings though, it
must have been more interesting.

Heh.

On Wed, 07 Oct 2009 13:15:22 +0200, Ace wrote:
On Wed, 07 Oct 2009 12:05:55 +0100, Roger Thorpe

Sure. Our English teachers always told us not to use the word 'get',
so it took me many years to accept that my usage thereof was in no way
incorrect. I think it was considered 'lazy' as there would always be a
more precise verb. Or some such ********.

For a similar reason I always pause before using the word 'nice' (it was
forbidden).

That's a strange one. Was there a reason given?

Same as 'get' - it's a weak word, there's probably a more precise and
better one.

regards, Ian SMith
--
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