What is the bridge balance conditions of an AC bridge?

AC bridge circuits work on the same basic principle as DC bridge circuits: that a balanced ratio of impedances (rather than resistances) will result in a “balanced” condition as indicated by the null-detector device.

What are the two conditions must be satisfied to make an AC bridge balance?

Two balance equations are always obtained for an ac bridge circuit. This follows from the fact that for balance in an ac bridge, both magnitude and phase relationships must be satisfied. This requires that real and imaginary terms must be separated, which give two equations to be satisfied for balance.

What are AC bridges and DC bridges?

The D.C bridges are used to measure the resistance while the A.C bridges are used to measure the impedances consisting capacitance and inductances. The D.C bridges use the D.C voltages as the excitation voltage while the A.C bridges use the alternating voltage as the excitation voltage.

What is AC bridge and on what principle it works how many types of AC bridge do you know?

The construction of the bridges is very simple. The bridge has four arms, one AC supply source and the balance detector. It works on the principle that the balance ratio of the impedances will give the balance condition to the circuit which is determined by the null detector.

What is the balance condition of Wheatstone bridge?

A Wheatstone bridge is said to be in a balanced condition when no current flows through the galvanometer. This condition can be achieved by adjusting the known resistance and variable resistance.

Which is the balanced condition?

When no current flows through the galvanometer it is known as the balanced condition of the galvanometer. The Wheatstone’s bridge will be in the balanced condition when the current through the galvanometer is zero.

What is AC bridge?

Definition: AC bridges are the circuits that are used for the measurement of electrical quantities such as inductance, capacitance, resistance. AC bridges operate with only AC signal. An AC bridge is used to provide phase shifting and providing a feedback path to the oscillator.

Why Wheatstone bridge is dc bridge?

Wheatstone’s bridge is a simple DC bridge, which is mainly having four arms. These four arms form a rhombus or square shape and each arm consists of one resistor. To find the value of unknown resistance, we need the galvanometer and DC voltage source.

How is the bridge balance?

When the voltage between point 1 and the negative side of the battery is equal to the voltage between point 2 and the negative side of the battery, the null detector will indicate zero and the bridge is said to be “balanced.” The bridge’s state of balance is solely dependent on the ratios of Ra/Rb and R1/R2, and is …

Why is AC bridge used?

AC Bridges are those circuits which are used for the measurement of unknown resistances, capacitance, inductance, frequency and mutual inductance. These bridges are very convenient and give the accurate result of the measurement. The construction of these bridge is very simple.

How is the bridge balanced?

What is the difference between AC bridge and DC bridge?

Comparison Chart Basis for Comparison AC Bridge DC Bridge Definition The bridge which is used for measuring t The DC bridge measures the unknown resis Supply AC supply is used DC supply is used Current Detector AC Detector DC Detector Components Resistive and Reactive Resistive

What is a potential problem in an AC bridge circuit?

A potential problem in sensitive AC bridge circuits is that of stray capacitance between either end of the null detector unit and ground (earth) potential. Because capacitances can “conduct” alternating current by charging and discharging, they form stray current paths to the AC voltage source which may affect bridge balance:

Which bridge is used to measure the unknown impedance of circuit?

The bridge which is used for measuring the unknown impedance of the circuit is known as the Wheatstone bridge. The DC bridge is used for measuring the unknown resistance of the circuit. The AC bridge uses the AC supply. The DC bridge uses the DC supply for measuring the resistance.

Why do capacitances affect the balance of a bridge?

Because capacitances can “conduct” alternating current by charging and discharging, they form stray current paths to the AC voltage source which may affect bridge balance: Stray capacitance to the ground may introduce errors into the bridge. While reed-type meters are imprecise, their operational principle is not.