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Unformatted text preview: Power = V TH R L +R TH ± 2 R TH = 18.75 W A Wheatstone bridge, shown on the right, is used to measure the resistance across R x . It is considered balanced when the voltage V G is zero. R 2 is an adjustable resistor. R 1 = 200 Ω, and R 3 = 400 Ω. 1. Derive an equation for R x in terms of R 1 , R 2 , and R 3 when the circuit is balanced. Applying voltage division principle v R R R V v R R R V x x Rx R 3 2 1 2 2 x x R R R R R R 3 2 1 2 x R R R R 1 3 2 1 3 2 R R R R x 2. If R x has an expected range of 500 Ω to 2 kΩ, what range will be required of R 2 to balance the circuit? 3 1 2 R R R R x 250 400 200 * 500 ) low ( 2 R 1000 400 200 * 000 , 2 ) high ( 2 R R 2 has a range of 250 Ω to 1 kΩ...
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 Spring '08
 Zhang
 Thévenin's theorem, R2 R3 R1, Rx R2

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