P 3.2-9 Determine the values of the resistances R₁ and R₂ in Figure P 3.2-9.

Figure P 3.2-9

Consider the current flow into the node where R1, the 5 Ω and the 7 Ω resistors meet.

We find the currents from

For current to flow into the node, the voltage away from the node subtracts the voltage at the node.

Plugging these to the current junction

Solving for R1

Now find the current into the junction between R1, R2, and 2 Ω Resistor.

Solving for R2

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This page last updated on January 14, 2019