# if devices are connected in series how will we calculate its wattage if the power of each appliance is given

### Asked by Balaaji Sri | 17th Sep, 2014, 10:34: PM

Expert Answer:

### When appliances of power *P*_{1}, P_{2}, P_{3}…*P*_{n} are connected in series with a voltage source, the effective power consumed P_{effective} is given by:
For example:
Consider the following electric circuit in which the electric bulbs of power rating 60W each are connected in series with the voltage source 220 V.
Here the bulbs are connected in series. The effective power consumed is:
In series connections bulbs share the power.Therefore each bulb will light up with power = 20 W.
Total power used = 20×3 =60 W

*P*…

_{1}, P_{2}, P_{3}*P*are connected in series with a voltage source, the effective power consumed P

_{n}_{effective}is given by:

### Answered by Jyothi Nair | 18th Sep, 2014, 12:18: PM

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