P 3.3-3 The ideal voltmeter in the circuit shown in Figure P 3.3-3 measures the voltage v.

(a) Suppose R₂ = 50 Ω. Determine the value of R₁.

(b) Suppose, instead, R₁ = 50 Ω. Determine the value of R₂.

(c) Suppose, instead, that the voltage source supplies 1.2 W of power. Determine the values of both R₁ and R₂.

Figure P 3.3-3.

(a) Suppose R₂ = 50 Ω. Determine the value of R₁.

Voltage division gives us

So if we know R2, solve for R1.

(b) Suppose, instead, R₁ = 50 Ω. Determine the value of R₂.

Use the voltage division and this time solve for R2

(c) Suppose, instead, that the voltage source supplies 1.2 W of power. Determine the values of both R₁ and R₂.

From Power we can determine i

R2 we can find from Ohm’s law

Now since v₂ is 8.00 V, that leaves v₁ to be 4.00 V, so R1 is

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This page last updated on January 17, 2019