40 W પાવર (Power) ધરાવતા બે વિદ્યુત બલ્બને (electric bulb) શ્રેણી જોડાણમાં (series connection) જોડવામાં આવે છે. આ જોડાણ દ્વારા વપરાતો કુલ પાવર (total power consumed) _______ થશે.

A 40 વૉટ (watt)
B 60 વૉટ (watt)
C 20 વૉટ (watt)
D 100 વૉટ (watt)

Verified Solution

Answer & Solution

Correct Answer

(C) 20 વૉટ (watt)

Step-by-step Solution

Detailed explanation

(C)
અહી, \(P_1=40 watt , P_2=40 watt\)
શ્રેણી જોડાણ માટે
\(\begin{array}{l}P=\frac{P_1 P_2}{P_1+P_2} \\ P=\frac{40 \times 40}{40+40} \\ \therefore P=20 \text { watt }\end{array}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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