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Calculate Internal Resistance Of Battery . Use the ohm’s law formula and kirchhoff’s voltage law formula to calculate the internal resistance. Then place a fixed known resistive load and measure the current and voltage across the load. How to Measure the Internal Resistance of a Battery from www.retrotechlab.com You will find five more. The measurement results you obtained are not enough to determine the internal resistance. Internal resistance is applied when you study the internal resistance of batteries.

Thermal Resistance Heat Sink Calculation . • rθcs = thermal resistance of the thermal interface material, (tim), used between device and heat sink • rθsa = thermal resistance of the heat sink to the ambient (surrounding air). This calculator assumes 1°c/w for the thermal resistance of the resistor body to the heat sink case. Comparison and Evaluation of Power Factor Correction Topologies for from file.scirp.org The following equation is used to calculate r hs, the thermal resistance of the heat sink: Ap = 0.1 x 0.1 = 0.01 m 2. 6 obtaining heat sink thermal resistance value: