QUICK REVIEW
Quick Review — Current, Resistance, and Ohm's Law — Algebra-Based
Refresh the essential ideas and relationships for Current, Resistance, and Ohm's Law in just a few minutes.
TIME
5–10 minutes
BEST FOR
A rapid refresh
FINISH WITH
Key ideas refreshed
After this quick review, you'll be able to...
recall the essential ideas and decide what to review next.
Choose how you want to review
Course Alignment
This Physics Sensei Unit Review is an independent learning resource. Use it to reinforce key concepts, prepare for homework, or review before a quiz or exam.
RESOURCE: Physics Sensei Unit Review | UNIT ID: EME-U06 | TOPIC: Current, Resistance, and Ohm's Law | COURSE LEVEL: Algebra-Based
BEST USED ✓ After learning the unit ✓ Before starting homework ✓ Before a quiz or exam
Your Review Plan
Complete these four stages to quickly refresh the essential ideas and confirm you're ready to continue.
4 Stages • Approximately 5–10 minutes.
Quick Recall
Let's quickly refresh what you already know. These short recall activities will help you bring the most important ideas back to mind before reviewing them.
QUICK RECALL
Recall Activity
Complete the three statements from memory before revealing the answer.
Write the definition of average current in terms of charge and elapsed time.
Reveal Answers
I = ΔQ/Δt, where 1 A = 1 C/s.
Why it works: Average current is the net charge crossing a surface divided by elapsed time: Iavg = ΔQ/Δt. A coulomb per second is defined as one ampere.
Ready to refresh the essentials?
Great! Now let's review the most important ideas you'll want to remember.
Essential Idea
Take one last look at the most important concept from this unit. If you remember this idea, the rest will come back much more easily.
ESSENTIAL IDEA
Current, charge, and units
The average current through a surface is I = ΔQ/Δt, with amperes equal to coulombs per second. Conventional current is defined in the positive-charge direction; electrons in metallic conductors drift opposite to I.
Example: If 12 C crosses a cross-section in 4 s, the average current is 3 A.
Sensei note: A negative carrier velocity does not mean a negative current without an explicitly chosen axis.
Ready to check your memory?
You've refreshed the essential idea. Now see how much you remember before moving on. Need a quick reminder?
Confidence Check
You've refreshed the essential ideas. Now answer this quick confidence check to confirm you're ready to move on.
CONFIDENCE CHECK
Graph slope
Answer all three without notes.
A resistor has V = 9 V at I = 1.5 A. Determine resistance.
Reveal Answers
R = V/I = 6 Ω.
Why it works: For an ohmic resistor, the ratio of potential difference to current is its resistance. Thus R = 9 V/1.5 A = 6 Ω.
Ready for your next step?
Great work! You've refreshed the essential ideas. Now choose the resource that best matches what you'd like to do next. Need a quick reminder?
Next Step
Great work!
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