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RESISTORS IN SERIES AND PARALLEL CIRCUITS

IN SERIES, so that the same current flows through all the components but a different potential difference (voltage) can exist across each one. IN PARALLEL, so that the same potential difference (voltage) exists across all the components but each component may carry a different current.

As an example, consider a very simple circuit consisting of four light bulbs and one 6 V battery. If a wire joins the battery to one bulb, to the next bulb, to the next bulb, to the next bulb, then back to the battery, in one continuous loop, the bulbs are said to be in series. If each bulb is wired to the battery in a separate loop, the bulbs are said to be in parallel. If the four light bulbs are connected in series, there is same current through all of them, and the voltage drop is 1.5 V across each bulb, which may not be sufficient to make them glow. If the light bulbs are connected in parallel, the currents through the light bulbs combine to form the current in the battery, while the voltage drop is 6.0 V across each bulb and they all glow.

In the set of experiments, the theoretical expressions used to calculate the total resistance in a combination of resistors will be tested experimentally. In addition, the expected distribution of the voltage and current to each resistor in a network will also be tested.

A powerpoint presentation on how ohm's law is applied in resistors connected in series or parallel combinations.


Resistors of value 20W , 20W and 30W are connected in parallel. Determine the value of the series resistance that must be added to the parallel combination to obtain a total resistance of 10W . If the completed circuit dissipates a power of 0.36 kW, find the current flowing.
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