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COMEDK2025PhysicsCurrent ElectricityActual

What is the potential difference between A and B in the above circuit element?

Options

  1. A40 V
  2. B35 V
  3. C25 V
  4. D55 V

Correct answer

B. 35 V

Step-by-step solution

The circuit consists of a series combination of resistors and voltage sources. The current I = 1 A flows from A to B. Applying Kirchhoff's Voltage Law (KVL) starting from point A to point B: V_A - I(18) - 10 - I(3) + 5 - I(9) = V_B Substituting the value of current I = 1 A : V_A - 1(18) - 10 - 1(3) + 5 - 1(9) = V_B V_A - 18 - 10 - 3 + 5 - 9 = V_B V_A - 35 = V_B V_A - V_B = 35 V Answer: 35 V

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