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NEET 2024 · Electrical Power & Heating Effect

Electrical Power & Heating Effect question from NEET 2024

Q15NEET 2024Medium

Electrical Power & Heating Effect

Two heaters $A$ and $B$ have power rating of $1\text{ kW}$ and $2\text{ kW}$ , respectively. Those two are first connected in series and then in parallel to a fixed power source. The ratio of power outputs for these two cases is:

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Answer: (b)

$R = V^2/P$ : $R_A = 2r$ , $R_B = r$ where $r = V^2/2000$ .
Series: $P_s = \dfrac{V^2}{3r}$ . Parallel: $P_p = \dfrac{V^2}{2r/3} = \dfrac{3V^2}{2r}$ .
$P_s : P_p = \dfrac13 : \dfrac32 = 2 : 9$ .
So the answer is (b) 2 : 9.

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