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 25 cm from the left end A of the 100 cm wire. Find Rx.
The bridge shown is supplied with Vs = 5 V and its output is open. Find the current Is drawn from the supply, in mA.
A bridge with four 1000 Ω arms is supplied with 2 V. When the sensor R₂ changes, the output reads Vab = 19.61 mV. Find the exact change ΔR of R₂.
A 300 Ω strain gauge is one arm (R₂) of a bridge with four equal 300 Ω arms and an excitation of 6 V. Find the power Pg dissipated in the gauge, in mW. Self-heating limits the excitation.
A bridge with 1000 Ω arms is excited with 10 V and has one active gauge (quarter bridge). The gauge factor is 2.05 and the strain is 600 µε. Find the bridge output Vo in mV.
A bridge with 350 Ω arms is excited with 2.5 V and has four active gauges, two in tension and two in compression (full bridge). The gauge factor is 2 and the strain is 1500 µε. Find the bridge output Vo in mV.
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