This question was asked inSupervisor Instructor Electrical Part B Technical Paper 2026Question 35 of 120 published · Gujarat Subordinate Service Selection BoardOpen paper
Q35ModerateNetwork Theorems

Which theorem states that a linear two-terminal network can be replaced by an equivalent voltage source and a series resistance?

Answer & step-by-step solution
Correct answer: B. Thevenin's theorem
Quick explanation

B — Thevenin's theorem: V_th (open-circuit voltage) in series with R_th. Norton's theorem uses a current source in parallel instead.

Detailed solution (in the paper’s original language)

સમજૂતી

Thevenin’s theorem નો ઉપયોગ linear two-terminal network ને સરળ equivalent form માં બદલવા માટે થાય છે.

આ theorem અનુસાર, બે terminals પરથી જોવામાં આવતો સંપૂર્ણ network એક equivalent voltage source Vth અને series resistance Rth (અથવા AC માં impedance) વડે દર્શાવી શકાય છે.

અેથી સાચો જવાબ Thevenin’s theorem છે.

મુખ્ય ખ્યાલ

Thevenin equivalent = Vth in series with Rth.

પરીક્ષા મુદ્દો

યાદ રાખો: Thevenin → voltage source in series; Norton → current source in parallel.

ઝડપી ટ્રિક

યાદ રાખો: Thevenin → voltage source in series; Norton → current source in parallel.

બીજા વિકલ્પો ખોટા કેમ છે

Superposition theorem અનેક sources ધરાવતા linear circuits માટે છે, maximum power transfer theorem load matching માટે છે અને Norton’s theorem current source in parallel આપે છે — voltage source in series નહીં.

સામાન્ય ભૂલ

Thevenin theorem ને Norton theorem સાથે ગૂંચવી દેવું.

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