Some authors suggest at low current density IR drop will be high and some suggests at high current density. In my case i observe at high current density IR drop is high. Will you please help to understand the basic behind the IR drop.
IR-drop describes the DC voltage that develops across a conductor as a result of its
electrical resistance. This voltage is proportional to the current that flows though the conductor (V=I.R) and results in a drop in voltage available at the load devices (Vload = Vsupply – Vdrop).
As you didn't mention whether you are using two electrode or three electrode system, it's difficult to figure out what is the actual problem behind the IR drop in your system.
When the circuit is open, the voltage on the power source terminals is maximum, and it is called as Open Circuit Voltage (OCV). If we close the circuit so as the current I is flowing through it, the voltage on terminals would equal U = (OCV - IR), where R is the inner resistance of the power source. So, the voltage drop depends on both current and inner resistance values. If the drop is high, the real voltage U is low, that's it. The current value is defined by the application requirements and cannot be reduced in many cases. Therefore, we should reduce the R value to make the power source efficient. Besides, the heat generation INSIDE the power source can be described as I2R (in J), and again you can see the importance of low inner resistance.
Thank you Prof. Yuriy for your answer. Topic is now bit clear to me. It will be very good If you give me some references on this.
these are some of our publications specifying the importance of low inner resistance in EDLC:
1. Y. Maletin, V. Strelko, N. Stryzhakova, et al. Carbon Based Electrochemical Double Layer Capacitors of Low Internal Resistance. Energy and Environment Research, 2013, vol. 3, #2, pp. 156-165.
2. Y. Maletin, N. Stryzhakova, S. Zelinsky, et al. Electrochemical Double Layer Capacitors and Hybrid Devices for Green Energy Applications. Green, 2014, vol. 4 (1–6), pp. 9–17.
3. Y. Maletin, N. Stryzhakova, S. Zelinsky, et al. New Approach to Ultracapacitor Technology: what it can offer to electrified vehicles. J. Energy Power Engineering, 2015, vol. 9, #6, pp. 585-591.
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