The ‘D.C.’ here mean direct current. It means that the current flows in one direction in the circuit.
The direction of the direct current refers to the conventional current, and it flows out of the positive (+) terminal of the cell / battery, around the circuit and flows back into the negative (-) terminal.
[Note: the direction of the electron flow is opposite to the conventional current]
To understand DC circuit, it will be useful to relate to a river system. Refer to the 3 videos below to learn more about 01: DC circuit similar to river system, 02: Series Circuit 03: Parallel Circuit and 04: Combined Circuit.
01: How is DC circuit related a river system
02: Series Circuit
03: Parallel Circuit
04: Combined Circuit (Series and Parallel)
Now, after you have the basic concepts and rules for the circuits, let’s look at some simple example to reinforce you understanding.
Example 01: Series Circuit
Example 02: Parallel Circuit
Example 03: Combined Circuit
Example 04: PP2012P2Q7 DC circuit : pd across 2 points on two separate branches.
Hope these series of videos help in you understanding of DC circuit.