Which equation should be used for Kirchoff's Law?

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The discussion focuses on applying Kirchhoff's Law to a circuit involving two resistors and an electromotive force (emf) battery. The user seeks clarification on whether to use the equation V(BA) = I*R1 + I*R2 or V(BA) = I*R1 + I*R2 - 5, with the latter accounting for the emf. Participants emphasize that the potential difference from point A to B should include the sum of potential differences across all components in the circuit. The consensus is that all voltage contributions must be considered to accurately apply Kirchhoff's Law. Understanding these principles is essential for correctly analyzing electrical circuits.
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http://img51.imageshack.us/i/unledbh.jpg/"
http://img51.imageshack.us/i/unledbh.jpg/

please see the above image.
if I is the current from left to right in the circuit,
then
what equation shall I use?

V(BA) = I*R1 +I*R2
or
V(BA)= I*R1 +I*R2 - 5 (counting the emf battery connected)

Thank You.Please explain?
 
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hi sachin123! :smile:

(try using the X2 icon just above the Reply box :wink:)

voltage is just another name for the difference in electric potential (p.d.) …

so the potential difference from A to B is the sum of the potential differences across all sections of AB …

so yes, you must add the p.d.s across all the components :wink:
 
Thank YOU tiny_tim:wink:
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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