Ch 2: Resistors Flashcards
Q: What is Ohm’s Law?
A: V = IR, where V is voltage, I is current, and R is resistance.
Q: What is the function of a resistor?
A: To limit the flow of electric current in a circuit.
Q: Define resistance.
A: The opposition to the flow of electric current, measured in ohms (Ω).
Q: What is the difference between resistors in series and parallel?
A: In series, resistances add up; in parallel, the reciprocal of resistances adds.
Q: What is a potentiometer?
A: A variable resistor used to adjust voltage or current in a circuit.
Q: What is a voltage divider?
A: A circuit that divides voltage using resistors in series.
Q: What happens to current in a resistor?
A: Current decreases proportionally to resistance.
Q: How do you read resistor color codes?
A: Each color represents a digit or multiplier; the bands indicate resistance.
Q: What is Thévenin’s theorem?
A: A method to simplify complex circuits into a single voltage source and resistance.
Q: What is the power rating of a resistor?
A: The maximum power a resistor can dissipate without damage.
Q: What is a breadboard?
A: A platform for prototyping circuits without soldering.
Q: What is “resistance tolerance”?
A: The permissible deviation from the nominal resistance value.
Q: Why are resistors used in series circuits?
A: To increase total resistance.
Q: Why are resistors used in parallel circuits?
A: To decrease total resistance.
Q: What is the unit of conductance?
A: Siemens (S), the reciprocal of resistance.
