✓ Board-verified
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 $\displaystyle 220$ 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.
(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.
More from Electricity
- In domestic electric circuits the wiring with 15 A current rating is for the electric devices which have2023 · asked 3×
- Assertion: Electrons move from lower potential to higher potential in a conductor. Reason (R): A dry cell…2024 · asked 3×
- The resistance of a wire of 0.01 cm radius and 1.0 cm length is 7 Ω. Calculate its resistivity. OR An…2026 · asked 3×
- Four identical resistors of 12 Ω each are connected in series to form a square ABCD as shown in the figure.…2025 · asked 3×
- The resistance of a wire of 0.01 cm radius is 7 ohms. If the resistivity of the material of the wire is 44 ×…2025 · asked 3×
- Read the following passage and answer the questions that follow: Swati, a class 10 student, observes that…2026 · asked 3×
- For verifying Ohm's law, we design an electric circuit diagram in which we show the arrangement of different…2023 · asked 3×
- The minimum number of identical bulbs of rating 4V; 6W, that can work safely with desired brightness, when…2025 · asked 3×
CBSE Class 10 Science past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.