power theorem
In maximum power theorem to get max power in a resistance R it should be equal to internal resistance r but what if There are other resistances in citcuit? Do we hve to neglect them?
16 Replies
@Gyro Gearloose
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.The net (external) resistance of the entire circuit must be equal to internal resistance r
actually, the net external resistance in a simple circuit, should be equal to the internal resistance. i would still suggest to use calculus to maximise the power function, in complex circuits.
Is there any proof of power theorem?
My bad, wording issue
Let's say the net external resistance is R and the internal resistance is r, and say R=kr for some real value k.
We know the current is equal to V/(R+r) for some emf V.
Hence, the total power is i^2 x r for each resistance
Comrade Rock Astley
As R is a function of r, we can use calculus to find the maximum possible power
@Real potato hey man if you feel like your doubt got solved please mark it as
+solved @user
like send that message with mentioning the user who solved it for you
you can even add more than 1 person as wellSir pls refer a proof note or video
The net resistance including the resistor in which we are supposed to maximise the power or excluding that?
see, there is a difference when we say to maximise the power output by the entire circuit, or to maximise the power output in a certain particular resistance in your network. for the latter case, make the total resistance a function of your required resistance, R(r). if you are looking for a certain specific problem, do you mind if you share the question?. i can make up a case and send you alternatively...
awesome discussion!
potato we good?
Have a look at this , we are supposed to find maximum power loss in R
please start a new thread for this, may get missed out otherwise
+solved @Deleted User @Comrade Rock Astley
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