Every circuit is comprised of three major components:

An electrical phenomenon is caused by flow of free electrons from one atom to another. The characteristics of current electricity are opposite to those of static electricity. Wires are made up of conductors such as copper or aluminum. Electrons, which continuously move in wire, are called Electric Current.

Every electric circuit, regardless of where it is or how large or small it is, has four basic parts: an energy source (AC or DC), a conductor (wire), an electrical load (device), and at least one controller (switch).

• a conductive “path,” such as wire, or printed etches on a circuit board;
• a “source” of electrical power, such as a battery or household wall outlet, and,
• a “load” that needs electrical power to operate, such as a lamp.

Ohm’s law describes current flow of a circuit as “current equals voltage divided by resistance”. If there is no EMF in a circuit the current will be zero so if this is zero then the current will also be zero so there must be EMF for there to be current flow.

The amount of current in a series circuit is the same through any component in the circuit. This is because there is only one path for current flow in a series circuit.

An ammeter is placed in series in the branch of the circuit being measured, so that its resistance adds to that branch. Normally, the ammeter’s resistance is very small compared with the resistances of the devices in the circuit, and so the extra resistance is negligible.

This means, current flow through resistance varies inversely with the resistance. Thus when we have a parallel circuit, the current flow through each of the n paths is defined by the value of the resistance, and the inverse variation of the current and resistance means that the voltage remains constant.

Current dividers or current division is the process of finding the individual branch currents in a parallel circuit were each parallel element has the same voltage. If the two parallel resistive branches are of equal value, the current will divide equally.

No, it is not always equally split (it often is when you first meet parallel branches for simplicity.)

The node or junction is the place where conductor splits to form couple parallel branches. When You have resistors in series, there is no such node/junction, the current doesn’t split and flows through each resistor.

As each electron has the same charge, each electron is carrying the same amount of energy, so the voltage across each branch of the parallel circuit will be the same because the voltage doesn’t epend on the number of electrons in each branch.

The key rule you need here is Kirchoff’s current law : the sum of currents flowing into a node is equal to the sum of currents flowing out of a node (or, equivalently, all currents at a node sum to zero). So yes, current does split at a junction (unless one branch has zero or infinite impedance!).

As more bulbs were added, the current increased. As more resistors are added in parallel, the total current strength increases. The overall resistance of the circuit must therefore have decreased. The current in each light bulb was the same because all the bulbs glowed with the same brightness.

Increasing the number of bulbs in a series circuit decreases the brightness of the bulbs. Bulbs in parallel are brighter than bulbs in series. In a parallel circuit the voltage for each bulb is the same as the voltage in the circuit. Unscrewing one bulb has no effect on the other bulb.

If you remove one resistor from the series and don’t connect the wires. It will be open circuit and no current will flow in the circuit. If you remove the resistor and connect the ends from where you have removed the resistor. Circuit current will increase depending upon the value of resistor removed.