Q2 of 12 Page 38

Explain the instances when arc lamps are used in rescue operations.

i. Arc lamps are used in rescue operations as searchlights in areas where electrification has been disrupted.

ii. They are kind of super shot lights which can light a large area. Hence, preferred in rescue operations.


iii. Also, these are much cheaper as compared to any other light source.


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A potential difference of 200 V is applied at a 200 Ω resistor for 5 minutes.

Calculate the amount of heat generated.

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A potential difference of 200 V is applied at a 200 Ω resistor for 5 minutes.

If 200 Ω is replaced by 100Ω, how much heat will be generated in 5 minutes?

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A potential difference of 200 V is applied at a 200 Ω resistor for 5 minutes.

If 400Ω resistance is used in this place for 5 minutes, how much heat is generated?

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Explain the working of a microwave oven.