The bridge circuit shown in Fig. 1 is balanced when R1=100 Ω, R2= 1000 Ω, and R3= 150 Ω. The bridge is energized from a 5V DC source. (a) What is the value of Rx? (b) Suppose each bridge resistor is capable of dissipating 250mW. Can the bridge be left in a balanced state without exceeding the power-dissipating capacity of the resistors, thereby damaging the bridge? And why?

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The bridge circuit shown in Fig. 1 is balanced when R1=100 Ω, R2= 1000 Ω, and R3= 150 Ω. The bridge is energized from a 5V DC source.

(a) What is the value of Rx?

(b) Suppose each bridge resistor is capable of dissipating 250mW. Can the bridge be left in a balanced state without exceeding the power-dissipating capacity of the resistors, thereby damaging the bridge? And why?

+
= (d'Arsonval) detector movement
Va
a
R₁
R3
R₂
R₂
Fig. 1 Wheatstone Bridge
12
Vb
b
Transcribed Image Text:+ = (d'Arsonval) detector movement Va a R₁ R3 R₂ R₂ Fig. 1 Wheatstone Bridge 12 Vb b
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