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  4. →Circuits basics: Ohm’s law and power

Circuits basics: Ohm’s law and power

Test your understanding of circuit fundamentals with a mixed-difficulty set on Ohm’s law and electric power. Work through real classroom-style scenarios involving voltage, current, resistance, and ene...

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108 questions
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About this quiz

What you’ll practice

Build fluency with Ohm’s law (V = IR) and power relationships (P = VI, P = I²R, P = V²/R) across common circuit situations. You’ll also get repetition on unit handling so your answers stay consistent.

Each question uses 4 options and there’s no timer, so you can pause to calculate carefully or review your reasoning.

Difficulty and quiz setup

Difficulty is mixed: straightforward plug-in questions appear alongside multi-step items that combine Ohm’s law with power and energy ideas. You can choose the question count and difficulty before starting to make it a quick warm-up or a full practice session.

  • Convert confidently between volts, amps, ohms, watts, and kilowatt-hours
  • Decide which formula fits the given information instead of guessing
  • Interpret what changes when resistance, voltage, or current is increased
  • Estimate results to catch impossible values before selecting an option
  • Practice rearranging equations without algebra mistakes

Common pitfalls to avoid

Many misses come from unit slips (mA vs A, kΩ vs Ω) or mixing up power and energy. Another frequent trap is applying series/parallel intuition incorrectly when the question only targets a single component’s V, I, or R.

Tips for higher accuracy

Write down what’s given and what’s asked, then pick the simplest matching equation. If your result seems extreme, do a quick sanity check: doubling current should quadruple power in P = I²R, while doubling voltage quadruples power in P = V²/R.

Sample questions

What is Ohm's Law formula?

  • A.V = IR
  • B.P = IV
  • C.I = VR
  • D.R = PI

What unit is electric current measured in?

  • A.Amperes
  • B.Volts
  • C.Ohms
  • D.Watts

What is the unit of resistance?

  • A.Ohm
  • B.Volt
  • C.Ampere
  • D.Watt

Quiz FAQ

How many questions are in this quiz?

This quiz has 108 questions on Ohm’s law, power, and related circuit basics.

Is there a time limit?

No. The quiz has no timer, so you can work at your own pace.

What answer format does the quiz use?

Each question is multiple-choice with 4 options.

Can I choose the number of questions and difficulty?

Yes. You can set the question count and select a difficulty level before you start.

What topics are covered besides V = IR?

You’ll practice power formulas (P = VI, P = I²R, P = V²/R), unit conversions, and typical circuit calculation scenarios.

Play this quiz in another language(7)

sk
Základy obvodov: Ohmov zákon a výkonSlovenčina
cs
Základy obvodů: Ohmův zákon a výkonČeština
de
Grundlagen der Schaltungen: Ohmsches Gesetz und LeistungDeutsch
es
Fundamentos de circuitos: Ley de Ohm y potenciaEspañol
pl
Podstawy obwodów: Prawo Ohma i mocPolski
hu
Áramkörök alapjai: Ohm törvénye és teljesítményMagyar

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