Question

Figure below shows an unbalanced Wheatstone bridge. What is the direction of the conventional current between B and D?

Answer 1

Wheatstone bridge

1. Wheatstone bridge helps in calculating the unknown resistance as it balances two legs of the bridge circuit.
2. The Wheatstone bridge has an unknown resistance component on one of its legs.
3. Wheatstone bridges are also called resistance bridges.

Flow of current in a circuit

1. In a series circuit, the first resistor's output current flows into the second resistor's input, resulting in the same current in each resistor.
2. In a parallel circuit, the current is different in each resistor. All of the resistors on one side are connected together, and all of the leads on the other side are connected together in a parallel circuit.
   

We can see from the diagram that

1. When we remove Resistance R, we can observe that the potential difference across terminal AD is less than the potential difference across terminal AB.
2. As a result, we can claim that D's potential is greater than B's.
3. When we connect Resistance R, the current will flow from greater potential to a lower potential, i.e. from D to B.
4. As a result, we receive the expected result: the potential will increase from D to B.

Hence, the flow of conventional current between $B$ and $D$ is from $D$ to $B$.