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Definition of "Wheatstone Bridge" |
An ac bridge circuit used to measure unknown values of resistance, inductance, or capacitance. The resistor labeled Rx in the diagram is the component to be measured. A bridge with four elements; resistors Ra, Rb and Rs are known values. When the ratio of Ra & Rb equals Rs & Rx, current is zero and Rx can be determined. Voltage [not shown] is applied to circuit nodes Ra/Rx & Rb/Rs. / A four arm resistance bridge where the balance is obtained by null deflection when the ratio of the adjacent arms are equal. / A simple circuit for measuring an unknown resistance by connecting it so as to form a quadrilateral with three known resistances and applying a voltage between a pair of opposite corners. / A network of four resistances, an emf source, and a galvanometer connected such that when the four resistances are matched, the galvanometer will show a zero deflection or "null" reading. / Internet Key Exchange is an IPsec standard protocol used to ensure security for virtual private network negotiation and remote host or network access. / a bridge circuit where all arms are resistors. The condition of balance in the circuit is used for precise measurement of resisors. In this case, one of the arms is an unknown resistor, another arm is a standard resistor (usually a variable resistor box), and two other arms (called ratio arms) are variable resistors with a well determined ratio. When the condition of balance is achieved, one can calculate the unknown resistor multiplying the standard resistor value by the ratio of ratio arms resistors. The precision of measurements is 0.05% for the range 10 ohms to 1 megohm. The Wheatstone bridge is used for resistor measurements at DC and AC (in the universal impedance bridges). Moreover, the Wheatstone bridge is widely used in resistive transducers where one or more arms is substituted by resistors the resistance of which depends on a physical variable (temperature, pressure, force, etc.). In these applications, the deflection from balance is used for measurement of the physical variable. |
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