FREE Bachelor of Electrical Engineering Electric Circuits Questions and Answers Flashcards

Using the superposition theorem, how are the contributions of multiple independent sources analyzed?

Answer: Each source is considered separately while others are deactivated

Superposition requires analyzing each independent source individually with all other independent sources turned off.

A 12 V battery with an internal resistance of 0.5 ohms is connected to a 5.5 ohm external resistor. What is the terminal voltage?

Answer: 11 V

Current = 12/6 = 2 A, and terminal voltage = 12 - (2 × 0.5) = 11 V.

In a balanced Wheatstone bridge, what is the current through the galvanometer?

Answer: Zero

When the bridge is balanced, the potential difference across the galvanometer is zero, so no current flows through it.

What happens to the total capacitance when two capacitors of 6 microfarads and 3 microfarads are connected in series?

Answer: 2 microfarads

For series capacitors, 1/C_total = 1/6 + 1/3 = 1/2, so C_total = 2 microfarads.

An inductor of 0.5 H carries a current that changes at a rate of 4 A/s. What is the induced EMF across the inductor?

Answer: 2 V

By Faraday's law, EMF = L × di/dt = 0.5 × 4 = 2 V.

Three identical resistors of 9 ohms each are connected in delta configuration. What is the equivalent resistance of each arm in the star (Y) conversion?

Answer: 3 ohms

For identical delta resistors, each star resistance = R_delta / 3 = 9 / 3 = 3 ohms.