[TechAssist] Re: Need advice from engineering folks.
- From: "tvservice" <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 5 May 2004 08:40:12 -0500
OHMS LAW
W= watts/power
I= current/amps
E=volts
I = E / R
example 120v X 2.5a = 300w or 300=2.5 X 120 or 300/120=2.5
multiply volt with current for watts
or divide volts into watts for current(amps)
or divide amps into watts for volts
example: You have six lamps on a given circuit, each lamp uses 300 watts.
Total of lamps on a circuit are 1800 watts and are powered with 120 volts.
The lamps will require 15 amps (1800/120=15)
hth
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "walter wood" <wwood_38478@xxxxxxxxx>
To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, May 04, 2004 9:54 PM
Subject: [TechAssist] Need advice from engineering folks.
> Watts divided volts equal amps.
> 100 watts divided by 100 volts = 1 amp.
> That's the way a broadcast engineer told me to
> remember Ohms Law 40 years ago.
> Now the reason for the question;
> I have provided the main outdoor sound system,
> gratis, for the last 3 years, for the Relay for
> Life charity.
> The local college provides the lights, and the
> electric company puts a tempoary service at the
> location.
> We've never had enough electricity.
> Thet are offering to put a permanent service there,
> and want to know how much IS enough.
> I measured the current through a 100 watt light
> bulb, on normal line voltage and read 0.82 amps.
> That's about right as the voltage was up from the
> example, therefore the amperage goes down.
> I measured a 60 watt bulb and got 0.5, exactly what
> it should be.
> I then measured a Peavey Session 400 amp, and it
> read 0.44 amps at idle, but it didn't take much
> volume to raise the draw to 1 amp.
> The back plate on this amp states 600 watts and 120
> volts.
> It is fused at 6 amps.
> Following the formula, it should pull 5 amps "maxed
> out".
> I know that's a lot of e-mail, but the question can
> be answered yes or know.
> "Will I be safe in requiring the amperage of all
> the amps and effects, etc. to equal the total of
> their fused ratings."
> I would think that would be more than adaquite, but
> I'm asking for the expert advice.
> I intend to ask for much more because we see the
> need getting larger in the future, and anyway, it's
> impossible to know what kind of equipment everyone
> will show up with.
> The college already knows the requirments for the
> lights.
> TIA
> Water
>
>
>
> =====
> Walter Wood
> Future Tech Home Center
> 2786 Hwy. 43 N.
> Lawrenceburg Tn. 38464
> 931-829-3337
> Fax 931-829-4044
> mailto:wwood_38478@xxxxxxxxx
>
>
>
>
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