Question

Refer to the circuit diagram given in the figure, which of the following observations are correct?

 

Observations:

A. Total resistance of circuit is 6 Ω

B. Current in Ammeter is 1 A

C. Potential across AB is 4 Volts

D. Potential across CD is 4 Volts

E. Total resistance of the circuit is 8 Ω

Choose the correct answer from the options given below:

• A. A, B and D only
• B. A, C and D only
• C. B, C and E only
• D. A, B and C only

Hint:

When analyzing circuits, always use Ohm’s law to calculate current and voltage drops across resistors. Series resistances add up, and the voltage is divided among the resistors in proportion to their resistance.

Answer 1

The Correct Option is A

We are given the following circuit diagram:

The total resistance R_total is the sum of the resistances in series:

The total current through the circuit is determined by Ohm's law:

The potential across AB is given by the voltage drop across the 4Ω resistor in series with the ammeter:

The potential across CD is also determined by the voltage drop across the 4Ω resistor:

Thus, the correct observations are A, B, and D.