39. Determine the unknown resistance (R3) in the circuit of Figure 80. FIGURE 80 10 mA 30 V Hot R₁ 680 Ω R5 www 270 02 R₂ www 1.0 ΚΩ R₁ www 270 02 R3 ww

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Maximum power transfer theorem

A resistive load will consume maximum power from a network when the load resistance is equal to the resistance of the network as viewed from the open-circuit terminals, with all energy sources removed leaving only the internal resistances. Physicist Moritz von Jacobi introduced the maximum power transfer theorem in 1940. Therefore, this theorem is also known as Jacobi's law.