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Power Loss

hi,

Here's the link to the simple circuit:
#-Link-Snipped-#

let us assume a circuit with two DC supplies of 5V and 3V, and a resistor of 1k in series with one another. Also 5V and 3V are opposing one another.

Now the power loss across the resistor is I*I*R. = 4mW.
The question is will there be any power loss across the 3V.

I feel ,there won't be any power loss across the 3V supply as the resultant 2V will be supplying the 2mA current to the circuit. Am I right.

Replies

  • reachrkata
    reachrkata
    In fact it gains power = 6mW.

    - Karthik
    😁
  • beenuseren
    beenuseren
    what does gaining power mean?
  • beenuseren
    beenuseren
    If I assume the power supplies to be batteries, then there will be power gain across 3V. But I have assumed the power supplies to be regulated power supplies which are ideal. That is, no internal resistance and 100% efficient.

    Now will there be any power loss across the 3V supply?
  • reachrkata
    reachrkata
    No. Since the current will flow from the 5V supply into the 3V supply, it will always gain power. It is like charging a battery.

    - Karthik

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