Questions: Current, Voltage, and Resistance

Question 1

In the water pipe analogy for circuits, what does water pressure represent?

• A. Current
• B. Resistance
• C. Voltage
• D. Power

Answer: (C)

Voltage is the electrical 'pressure' that drives charge through the circuit, analogous to water pressure driving water through pipes.

Question 2

Current is used up as it flows through a light bulb.

• T. True
• F. False

Answer: False

Current entering a light bulb equals current leaving it. The bulb converts electrical energy to light and heat, but the flow of charge (current) is not consumed.

Question 3

What three factors are needed to describe the basic behavior of any electric circuit?

Model answer: Current (the flow of charge, in amps), voltage (the electrical push, in volts), and resistance (the opposition to flow, in ohms).

These three quantities — current, voltage, and resistance — are the fundamental building blocks of circuit analysis, connected by Ohm's Law: V = IR.