Electrical and Electronics Engineering Chapter 1: DC Circuit MCQ Quiz

Electrical Resistance and Inductance

• The unit of electrical resistance is ohms (Ω).
• Resistors commonly resist the flow of electric current.
• The unit of inductance is henries (H).
• In a series circuit, the total resistance is equal to the sum of the individual resistances.

Inductors and Capacitors

• Inductors resist changes in electric current.
• In a DC circuit, an inductor behaves as a short circuit, allowing maximum current flow.
• The primary purpose of using capacitors in an AC circuit is to filter or regulate the voltage.

Voltage and Current Sources

• A voltage source provides a fixed voltage in a circuit.
• In a DC circuit, an ideal voltage source provides a constant voltage regardless of the current drawn.
• The symbol commonly used to represent a voltage source in a circuit diagram is V.
• A current source provides a fixed current in a circuit.
• In a DC circuit, an ideal current source provides a constant current regardless of the voltage across it.
• The symbol commonly used to represent a current source in a circuit diagram is I.
• In a circuit with both a voltage source and a current source in parallel, the current through each source is determined by the internal resistance of the source.
• A true statement about voltage and current sources is that a voltage source provides a fixed voltage, while a current source provides a fixed current.
• A battery is typically represented by a voltage source in a circuit diagram.