CBSE Class 12 Physics 2018 Delhi Set 1 Paper

Question : 6

Total: 26

SECTION -B

Two electric bulbs P and Q have their resistances in the ratio of 1:2. They are connected in series across a battery. Find the ratio of the power dissipation in these bulbs.

Solution:

Formula

‌ Stating that currents are equal
‌ Ratio of powers
‌ Power ‌=R2R
The current, in the two bulbs, is the same as they are connected in series.
∴‌‌‌

‌=‌

I2R1

I2R2

=‌

‌=‌

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