Question

In series circuit, which of the following quantity remains same throughout the circuit:
A. Current and voltage
B. Current
C. None
D. Voltage

Answer 1

Hint: There are basically two types of combination of electrical instruments or two ways in which the circuit elements could be connected. This includes combination in series and parallel. In series combination, mostly only one end of the various circuit elements is connected to one another whereas in parallel, both the ends of various circuit elements are connected to one another.

Complete answer:
The series combination is the one in which one end of the various circuit elements is connected to one another. This suggests that the current has to pass through all the elements. Hence the series circuit is the one in which the current is the same through all the elements. In other words, if the current is the same in various circuit elements, then these elements are said to be connected in series.

The parallel combination is the one in which both the ends of the various circuit elements are connected to one another. This suggests that the voltage, which is the potential difference between the two ends, has to be the same across all the elements. Hence the parallel circuit is the one in which the voltage is the same across the elements. In other words, if the voltage is the same in various circuit elements, then these elements are said to be connected in parallel.

Note:
It should be noted that if the current in two elements is the same, it is said to be in series. And when the potential difference is the same across the ends of two ends, it means that the elements are parallel, irrespective of that the two elements don’t have the terminals connected to each other.