[Elecraft] K3 Suddenly died

[Walter Underwood]

Of course. My point was "for a given current", so 20A at 120V and 20A at 13.8V.  --wunder, K6WRU

On Oct 7, 2013, at 9:03 AM, Richard Fjeld wrote:

> I stated the voltage drop across a resistance (the wire conductor) is directly proportional to the amount of current flow (amperage) through it.
> 
> For a given resistance, as the current increases through it, the voltage drop increases in it.
> 
> Changing the supply voltage will change the current flow through the same conductor resistance and affect the voltage drop in it.
> 
> 
> 
> -----Original Message----- From: Walter Underwood
> Sent: Monday, October 07, 2013 10:20 AM
> To: Elecraft Reflector
> Subject: Re: [Elecraft] K3 Suddenly died
> 
> There is a point which could be made -- the percentage voltage drop is bigger at 12V than at 120V.
> 
> If the voltage drop on your power supply wire is 2V for a given current, that is the same regardless of the supply voltage. With a 120V supply, the wire will deliver 118V and with 13.8V it will deliver 11.8V.
> 
> So the same voltage drop can matter more at lower supply voltages.
> 
> Note that I'm ignoring the difference between AC and DC and skin effect.
> 
> wunder
> K6WRU
>