ICSE Class 10 Physics 2022 Solved Paper

An appliance rated $440 {\W}, 220 {\V}$ is connected across $220 {\V}$ supply.

Question : 33 of 45

Marks: +1, -0

Calculate the resistance of the appliance.

Solution:

Let

{\P}= {\VI}

and

{\I}=\;{ {\V}}/{ {\R}}

∵ \;\; {\P}\;=\;{ {\V}^2}/{ {\R}}

{\R}\;=\;{ {\V}^2}/{ {\P}}

\;=\;{220 × 220}/{440}

\;=110 Ω

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