why doesnt the potential difference change in a paralell circuit but it reduces at each resistor in a series?

Answer 1

resistors in series have multiple drops of voltage second one would see what the first one dropped as it source depending on current as to how much it drops. Parallel circuits both resistors have the same source.
Polarity does not make a difference with resistors only capacitors, and diodes, transistors, and other active devices.

Answer 2

Well, it's the nature of the circuit. If you have items in parallel with a voltage, they will all see the same voltage. If you take a probe and go along the wire connecting the items in parallel, you will get the same voltage reading, because realistically, the probes are directly connected to the voltage source, by some length of wire or trace.

For series, it like kinks in a hose. The resistors are like kinks. So if you have a potential pressure across the whole hose(circuit) the kinks(resistors) will drop some of the overall pressure, depending on how "kinked" it is.

Answer 3

Well at the JUNCTION of a parallel circuit it should split (evenly) into however many new currents there are...

it is usually assumed that the circuit is made of negligibly resistant material (in the case of textbook problems)
so
travelling WITH the current should cause an increase, travelling against should cause a decrease, and through resistor, energy is disspiated so a decrease there too

Answer 4

The easiest way to visualize this is to think of a battery. Any and all of the components placed in parallel would simply be place from the positive terminal to the negative terminal. If you were to measure the voltage on any one component, you would simply be measuring the battery voltage since the voltage would be the same across all of the components.
However, in a series circuit, the components would be piggy backed to each other from the positive to the negative, and the voltage would have to pass through a component to get to the next component. Since the voltage at the battery would have to equal the voltages at each component added together, each component is going to drop a portion of the battery voltage as the current passes through it.

Answer 5

years ago they had christmas tree lites wired in seriesif one goes out the rest go out .that is because the current goes threw on to the other.this load was caulated for x feet of lites with out a noticeable difference in briteness .in a paralell circut you have a main line with perodic drop offs.but rember thatthere is a constant supply voltage .[in a series circut there is a void at every lite.and you only have x amount of voltage.120]