Re: OT: volt and current (ALSA sound recording frustration)
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>---- Original Message ----
>From: eduardo@kalinowski.com.br
>To: debian-user@lists.debian.org
>Subject: Re: OT: volt and current (ALSA sound recording frustration)
>Date: Fri, 28 Nov 2008 17:16:47 -0200
>
>>lee escreveu:
>>> On Fri, Nov 28, 2008 at 06:59:06PM +0000, Tzafrir Cohen wrote:
>>>
>>>
>>>> A voltmeter has two connectors and shows the potential
>differences
>>>> between them.
>>>>
>>>> This is unlike an Ampermeter that shows the current flowing
>through it.
>>>>
>>>
>>> If you have a multimeter that can measure voltage or current, both
>>> modes are basically the same. The difference is only in where most
>of
>>> the current flows.
>>>
>>> Is it even possible to measure a mere potential
>>
>>Actually, they're two completely different ways of measuring two
>>different things. They just happen to be measureable with the same
>>equipment, but this equipment combines two functionalities into a
>single
>>physical device.
>>
>>--
>>Eduardo M Kalinowski
>>eduardo@kalinowski.com.br
>>
The voltmeter is usually placed in parallel with the two (plus and
minus if DC) connections. the voltmeter has a large but known
internal resistance. If it really is a meter (with a needle rather
than a digital readout)the deflection is actually a measure of the
(small) current through the (large) resistance. The ammeter is
usually placed in series with the connection and, soas not to affect
the current flow, usually has a small internal resistance. Again the
deflection of the "needle" is a measure of the current.
Larry
>>
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