Devices in Series and Parallel
Devices in Series and Parallel
Sometimes we come across a circuit which consists of more than one type of combination of resistance. That means some resistance may be parallel to each other and this combination can be in series with another resistance. Or we have different parallel combinations of resistance which are in series to each other. A combination circuit has some resistances connected in series combination and some parallel combination.
This type of combination is also called complex circuit. While solving problems of mixed combination of resistances, there are many points to be considered as given below:
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Illustration: Consider the circuit diagram as shown in the figure then find the equivalent resistance of the circuit. |
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Solution: From the combination, it can be observed that are connected in series order. As current through
is same. So, their equivalent resistance is
Now, the given circuit can be redrawn as shown in the figure
Now, it can be seen that are in parallel combination. As, currents through
are different. So, their equivalent resistance can be calculated as below
Now, the given circuit can be redrawn as shown in the figure
Now, it is clear from the diagram that all the resistances are in series combination.
As, current through is same.
Equivalent resistance of the circuit is
The battery has potential as = 16 V
By using the formula V = IR
As current flowing through is same because they are in series. So
and potential drop across them is
As is an equivalent resistance for a parallel combination of
, So potential drop across them is the same
As is an equivalent resistance for a series combination of
, So current flowing through is the same i.e 0.67 A
Calculate the equivalent resistance between A and B | |||
| Right Option : C | |||
| View Explanation | |||
In a circuit if two resistance of 3ohms each are connected in parralel and then connected in series with another combination of two resistance of 2 ohms which are connected in parallel then what is the net resistance of the circuit | |||
| Right Option : C | |||
| View Explanation | |||
In our houses all electrical devices operate on 220 V. It implies that- | |||
| Right Option : A | |||
| View Explanation | |||
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