Voltage, Watt, Current.... Resistance?

Thread Starter

cheddy

Joined Oct 19, 2007
87
Hey i'm just exploring the interdependency of electronic values please explain to me if my logic is correct here.

Let's say we have a power supply that supplies 12V and 100W.

P=E*I
100W=12V*I
I=8.3A

So another way to state 12V, 100W is that it's 12V 8.6A.

E=I*R
12V=8.3A*R
R=1.45ohm

Another way would be to say that the power supply can supply 12V just as long as the parallel power distribution resistance exceed 1.45ohms?
 

John Luciani

Joined Apr 3, 2007
477
A better way to say it would be that the power supply can deliver 12V with a maximum
current of 8.3A.

When determing whether a power supply is suitable for an application it is usually
more convenient to use volts and amps rather than volts and ohms.

(* jcl *)
 

Thread Starter

cheddy

Joined Oct 19, 2007
87
A better way to say it would be that the power supply can deliver 12V with a maximum
current of 8.3A.

When determing whether a power supply is suitable for an application it is usually
more convenient to use volts and amps rather than volts and ohms.

(* jcl *)
I agree completely.
 

recca02

Joined Apr 2, 2007
1,214
specification of current and voltage removes ambiguities since m/c may draw more current for a given power due to diff pf.
 
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