Two devices rated 60W, 110V and 40W, 110V are connected in series across 110V dc supply. Find the actual
power consumed by each of the load and the total current drawn from the supply. If the loads were connected in
parallel across the same supply, what would be the individual powers taken by each of the loads and the total power
taken from the source.
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Serially:
P=U2R=>R=U2P
t 220 Volt and 60 W the resistance is 80623 ohm for each bulb. In a serial connection the resistances add up, meaning, the two bulbs together have 161313 ohm. Repeating the above formula, we get a total power consumption of 30 watt. So each bulb consumes 15 watt.
Parallelly:
The total resistance in a parallel connection can be calculated as
RT=R1∗R2R1+R2
which is 40313 ohm. Thus, again repeating the formula for power consumption (P=U2R), the total power consumption is 120 watt. Which is 60 watt for each bulb.
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