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Magnetic Effects of Electric Current — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMagnetic Effects of Electric Current3 Marks
Question
Three appliances are connected in parallel to the same source which provides a voltage of 220V. A fuse connected to the source will blow if the current from the source exceeds 10A. If the three appliances are rated at 60W, 500W and 1200W at 220V, will the fuse blow?
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Answer

Voltage of power supply, V = 220V
Power rating of the first appliance = 60W
So, current drawn by the first appliance $=\frac{60}{220}=0.27\text{A}$
Power rating of the second appliance = 500W
So, current drawn by the second appliance $=\frac{500}{220}=2.27\text{A}$
Power rating of the first appliance = 1200W
So, current drawn by the first appliance $=\frac{1200}{220}=5.45\text{A}$
Net current drawn by all the appliances = 0.27 + 2.27 + 5.45 = 5.99A
It is given that the rating of the fuse is 10 A. It will not blow when all the appliances are used together because current capacity of the fuse is more than the value of current drawn by the device.

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