MILP formulation for minimum set Vertex cover problem. Current in circuit without resistance- with two cells connected in reverse. With two equations you can find two unknowns. Your post here is interesting because it includes both a particular instance and a nice conceptual question about the meaning of "internal resistance". E in this case is the emf, which you can work out with Ohm's Law. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Is this photo of a road detouring around a tree authentic? Asking for help, clarification, or responding to other answers. Hey you're getting wrong, the equivalent emf(voltage) of system will be 16V-8V because both have opposite poles facing each other, so their will be net flor of current (-ve to +ve) according to the cell of greater emf(16V cell).Then your total resistance is $$5+1.6+1.4 = 8 \Omega$$(all are in series) . It would be nice if you also explain your answer and the formulae involved. Question involving EMF and internal resistance ! The emf is measured in measured in volts. We would normally expect an AA cell to have an EMF of about 1.5 V and an internal resistance of about 1 Ω. Any advice? I would try to solve with an Req, but I need the current through each resistor. We model this behaviour by simple model depicted on your picture; we assume that the real source consists of idealized source -| |- that gives the emf and has not resistance, and of ordinary ohmic resistance (2 $\Omega$ in your case). Note also that since the chemical reactions involve substances with resistance, it is not possible to create the emf without an internal resistance.
It's much easier to use the EMF equation to work this out: Where EMF is what you are calculating (in volts), $R =$ Resistance of the component (in this case, the resistor), $${\rm EMF} = 0.5(10+2)$$ Solved Examples for EMF Formula. When electricity flows round a circuit the internal resistance of the cell itself resists the flow of current and so thermal (heat) energy is wasted in the cell itself. But, there are no ideal voltage sources, i.e., all real voltage sources have some maximum current delivered into a short circuit. Q.1: Consider that we have a circuit with a potential difference of 3.2 V, with a current of 0.6 A. But, I had issues trying to solve the series of equations with 5 resistors in the circuit. A battery of internal resistance 2 Ohms is connected to an external resistance of 10 ohms.