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 conditions must be satisfied for the AC bridge?

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 are the DC measuring bridges?

DC bridges are used to measure the value of unknown resistance. The circuit diagram of DC bridge looks like as shown in below figure. The above DC bridge has four arms and each arm consists of a resistor.

How does AC bridge work?

The AC bridges are very convenient and give the accurate result of the measurement. 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.

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.

Why do you get two conditions for balance in an AC bridge?

In AC bridges, there are two conditions to get bridge balance condition. These two are independent conditions for balance and both of them must be satisfied for the bridge to be balanced.

What is the balanced condition of Wheatstone bridge?

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. Note: In a wheatstone bridge we have two known resistances and two unknown resistances.

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 does an AC bridge work?

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.

Why use Maxwell bridge instead of AC bridge to measure unknown inductance?

Advantages of Maxwell’s Bridge The advantages of a Maxwell Bridge are: The frequency does not appear in the final expression of both equations, hence it is independent of frequency. Maxwell’s inductor capacitance bridge is very useful for the wide range of measurement of inductor at audio frequencies.