⚛️ Physics Quiz 18: Current, Resistance, and Circuits

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⚛️ Physics · Quiz 018

Explore how voltage, resistance, and circuit arrangement affect current through five questions on simple electrical circuits.

Learning goalCalculate current and equivalent resistance in simple resistor circuits and interpret branch currents using Ohm's law and charge conservation.

  • 5 questions
  • Foundation
  • Explanations after finishing
Answered 0/5
FoundationWhich expression defines electric current I in terms of charge transfer?
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Current measures how quickly net charge crosses a chosen surface.

UnderstandingFor an ohmic resistor whose resistance remains constant, what happens to the current if the voltage across it is doubled?
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Use V = IR with R fixed.

ApplicationAn ideal 12 V source is connected across a single 6.0 ohm resistor. What current flows?
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Use I = V/R.

InterpretationTwo identical 6.0 ohm resistors are connected to the same ideal 12 V source, first in series and then in parallel. Which statement is correct about the total current drawn from the source?
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Find the equivalent resistance in each arrangement before using I_total = V/R_eq.

ConnectionA 6.0 ohm resistor and a 3.0 ohm resistor are connected in parallel across an ideal 12 V source. Which set is correct?
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Parallel branches have the same voltage. Calculate each branch current, add them at the junction, then infer R_eq.

Review the concepts

A short refresher before you begin. Worked answers appear after you select Finish Quiz.

Voltage: voltage describes a difference in electric potential between two points in a circuit.

Current and resistance: current describes the flow of electric charge; resistance describes how a component opposes that flow under specified conditions.

The model: these questions use ideal voltage sources and fixed resistor values. Identify the connections and the assumptions before calculating.

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