Question

Difference between dc bridge and ac bridge

Answer 1

Difference Between DC Bridge and AC bridge:
Bridge circuits are of immense importance in measurement system technology. They provide an accurate method of measuring resistance, inductance and capacitance values.
The main difference is that AC bridge is able to take measurements more quickly then DC bridge. The most accurate AC bridge generally settles within 20 seconds and produces new measurement after every 10 seconds. Where as the most accurate DC bridge is capable of settling down after 2 or more minutes but then produces the new measurement at the same rate as AC bridge. So, AC bridges are preferred for time critical measurements. Some meteorologists prefer AC bridge because measurements can be obtained more quickly while some have chosen DC bridge because of cost constraints.

Answer 2

The differences between a DC bridge and an AC bridge are:
DC bridge

1. DC supply is used.

2. A DC current detector is used.

3. Only resistive components are used.

4. There is no need for Wegner's earthing device.

5. Balancing time is relatively less.

AC bridge

1. AC supply is used.

2. AC current detector is used.

3. Resistive and reactive components are used.

4. Wagner's earthing device is required.

5. Balancing time is high because AC supply is used.