Three 30.0-W, 130-V lightbulbs are connected across a ?V = 130-V power source, a

Question

Three 30.0-W, 130-V lightbulbs are connected across a ?V = 130-V power source, as shown in the figure below. Find the total power delivered to the three bulbs and the potential difference across each. Assume the resistance of each bulb is constant (even though, in reality, the resistance increases markedly with current).

(a) Find the total power delivered to the three bulbs.
W

(b) Find the potential difference across each bulb.
?VR1 = V
?VR2 = V
?VR3 = V
http://www.webassign.net/sercp9/18-p-048-alt.gif

Explanation / Answer

If the bulbs are connected in series, the potential would be distrubuted evenly as (130/3)V and if the bulbs are connected in parallel, the potential across them is same and it is 130V.

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