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तीन बल्ब 40 W - 110 V , 40 W - 110 V तथा 80W-110V के हैं । इन्हें परस्पर किस प्रकार जोड़ें कि 220 V कि सप्लाई से जलाने पर उनमें समान्य दीप्ति हो ?

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बल्बों में धाराएँ क्रमशः `(4)/(11),(4)/(11),(8)/(11)` ऐम्पियर होनी चाहिए ।
40 W - 40 W के बल्ब परस्पर समान्तर - क्रम में तथा इनके श्रेणीक्रम में 80 w का बल्ब ।

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