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Three resistances $ R, 2R$ and $3R$ are connected in parallel to a battery. Then

$\begin {array} {1 1} (A)\;The \: potential\: drop \:across \: the\: 3R \: is \:maximum \\ (B)\;The\: current\: through\: each \: resistance\: is\: the\: same \\ (C)\;The \: heat\: developed\: in\: 3R \: is \: maximum \\ (D)\;The\: heat\: developed\: in\: R\: is \: maximum \end {array}$


1 Answer

The potential difference across all of them is the same (parallel)!!
and heat or energy = Power dissipated =$ V^2$ t /R, so it is inversely proportional to resistance.
Hence heat develeloped is maximum in the case of R.
Ans : (D)


answered Feb 10, 2014 by thanvigandhi_1
edited Sep 2, 2014 by thagee.vedartham

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