a. Determine the Thevénin equivalent circuit for the network external to the resistor R in...

a. Determine the Thevénin equivalent circuit for the network external to the resistor R in Fig. 1.

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b. Find the current through the resistor R if its value is 20 Ω, 50 Ω, and 100 Ω.

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c. Without having the Thévenin equivalent circuit, what would you have to do to find the current through the resistor R for all the values of part (b)?

FIG. 1