Op-Amp - NPN BJT Current Monitor.
Rload1 (10 Ω) in parallel with Rload2 (20 Ω) is equivalent to 20/3 Ω ≈ 6.667 Ω (6.65 Ω in E96 and E192). The combination is the fixed portion of the load being monitored.
Rload3 (10 Ω) in parallel with Rlvar (50 Ω) is equivalent to 50/6 Ω ≈ 8.333 Ω. The combination is the variable portion of the load being monitored.
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