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Science · 2024 · 3 marks
CBSE 2024 · Region 1 · Set 2 · Q33
(i) Name two safety measures commonly used in electric circuits and appliances. (ii) The power rating of an electric oven is 220 V; 2 kW. If it is…
(i)
Name two safety measures commonly used in electric circuits and appliances.
(ii)
The power rating of an electric oven is $\displaystyle 220$ V; $\displaystyle 2$ kW. If it is used in a domestic electric circuit of current rating of 5A, what result do you expect ? Justify your answer with necessary calculations.
Marking-scheme solution
(i)
• Electric fuse and Earth wire
(ii)
I = P/V
\[=\frac{200 \varnothing \mathrm{~W}}{22 \varnothing \mathrm{~V}}=9.09 \mathrm{~A}
\]
Since, current drawn by the oven is greater than the rated value of current, \(\displaystyle (9 \cdot 09 \mathrm{~A}>5 \mathrm{~A})\), the fuse wire melts/ the electric oven stops working.
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.