In a slide-wire (metre) bridge a known 5 Ω resistor sits in the left gap and an unknown resistor Rₓ in the right gap. The galvanometer reads zero when the jockey is 40 cm from the left end A of the 100 cm wire. Find Rx.
In the bridge shown, Vs = 5 V, R₁ = 1000 Ω and R₂ = 500 Ω. Find the voltage Va of node a with respect to the negative supply rail.
A 250 Ω strain gauge is one arm (R₂) of a bridge with four equal 250 Ω arms and an excitation of 10 V. Find the power Pg dissipated in the gauge, in mW. Self-heating limits the excitation.
A bridge with four 500 Ω arms is supplied with 9 V. When the sensor R₂ changes, the output reads Vab = 44.55 mV. Find the exact change ΔR of R₂.
A bridge with 350 Ω arms is excited with 3 V and has one active gauge (quarter bridge). The gauge factor is 2 and the strain is 1000 µε. Find the bridge output Vo in mV.
A bridge with 120 Ω arms is excited with 5 V and has two active gauges in adjacent arms, one in tension and one in compression (half bridge). The gauge factor is 2.12 and the strain is 250 µε. Find the bridge output Vo in mV.
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