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Study calculus-based electricity and magnetism through clear explanations, labeled models, worked examples and original practice. Units 1–4 cover Electric Charges, Fields, and Gauss’s Law, Electric Potential, Conductors and Capacitors, and Electric Circuits.
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Your AP Physics C: Electricity & Magnetism learning path
AP PHYSICS C: E&M · STUDY GUIDE
Your learning,
organized.
Choose a unit, expand an official topic, and open a focused lesson. E&M Units 1–4 are available as a review edition. These correspond to official Units 8–11; official topic numbers are retained.
6 units75 focused lessonsLearn · Explore · Practice · Review
Review edition · Teacher review pending
Review edition · Teacher review pending
Choose a unit, then open a topic.
No matching topics. Try a different word or clear your search.
The selector uses official College Board unit numbers. Existing Refresh Kid lesson paths and course-unit numbers stay the same.
01 Electric Charges, Fields, and Gauss’s Law 20 lessons · Review edition
Begin with charge transfer and forces. Build toward vector fields, charge-distribution integrals, electric flux and Gauss’s law. 40 original questions, 60 recall cards and 20 written challenges. Every lesson follows Learn → Explore → Practice → Review. Teacher review and student testing remain pending.
8.1 Electric Charge and Electric Force
8.2 Conservation of Electric Charge and the Process of Charging
8.3 Electric Fields
8.4 Electric Fields of Charge Distributions
8.5 Electric Flux
02 Electric Potential 17 lessons · Review edition
Connect electric potential, configuration energy and work. Add scalar potentials, integrate fields and charge distributions, read equipotential maps, and check whether motion is energetically accessible. 34 original questions, 51 recall cards and 17 written challenges follow Learn → Explore → Practice → Review. Official Topics 9.1–9.3; independent teacher review and student testing remain pending.
9.1 Electric Potential Energy
9.2 Electric Potential
- A volt is energy per charge, not energy itself
- Zero potential and zero field are different statements
- A voltage compares two points using one reference
- The electric work depends on endpoints, not detours
- Signed field area gives the potential change
- Field is negative slope, not potential height
- Equal-potential contours reveal field direction and strength
- A rod’s potential adds scalar charge contributions
- Integrate the potential above a rod’s midpoint
- A ring can have maximum potential where its field is zero
- Equal distances simplify the center potential of an arc
- An infinite line needs a finite potential reference
03 Conductors and Capacitors 16 lessons · Review edition
Explain conductors and charge redistribution, derive capacitance for three geometries, follow particles between plates, and compare stored energy and dielectrics under fixed charge or fixed voltage. 32 original questions, 48 recall cards and 16 written challenges follow Learn → Explore → Practice → Review. Official Topics 10.1–10.4; independent teacher review and student testing remain pending.
10.1 Electrostatics with Conductors
10.2 Redistribution of Charge Between Conductors
10.3 Capacitors
- Capacitance is charge per potential difference
- Area and separation set parallel-plate capacitance
- A uniform plate field bends a charged particle’s path
- Integrate the field between concentric spheres
- A cylindrical gap produces a logarithmic voltage
- Charging work is the area under the voltage curve
- State what stays fixed before moving the plates
04 Electric Circuits 22 lessons · Review edition
Connect current and carrier flow to resistance and power. Read circuit nodes, solve resistor and capacitor networks, account for real meters and batteries, and derive RC charging, discharging and energy balances. 44 original questions, 66 recall cards and 22 written challenges follow Learn → Explore → Practice → Review. Official Topics 11.1–11.8; independent teacher review and student testing remain pending.
11.1 Electric Current
11.2 Simple Circuits
11.3 Resistance, Resistivity, and Ohm’s Law
11.4 Electric Power
11.5 Compound Direct Current Circuits
11.6 Kirchhoff’s Loop Rule
11.7 Kirchhoff’s Junction Rule
11.8 Resistor-Capacitor (RC) Circuits
- Series capacitors share charge under a neutral-junction condition
- Parallel capacitors add charge at a common voltage
- A charging capacitor gradually reduces the driving current
- Discharge reverses current while voltage decays
- Preserve capacitor voltage across a switch change
- A logarithmic plot reveals the RC timescale
- Battery work divides between stored energy and resistor heat
05 Magnetic Fields and Electromagnetism Lessons not yet published
Official course unit 12. Focused self-study lessons for this unit are not yet published.
06 Electromagnetic Induction Lessons not yet published
Official course unit 13. Focused self-study lessons for this unit are not yet published.
E&M Unit 1 corresponds to official Unit 8. Calculus bridge: add small charge or flux contributions with definite integrals. Examples use k ≈ 9.0 × 10⁹ N·m²/C² and ε₀ = 1/(4πk), with rounding stated. Official College Board framework. Focused lesson titles and original questions are Refresh Kid’s organization. This is a review edition; independent teacher review and student testing remain pending.
Curriculum sources & scope · AP Physics C: Electricity & Magnetism
College Board
Official units 8–13; includes 2026–27 clarifications.
Complete official content is in the CED unit guides, including topic IDs, learning objectives, essential knowledge and course skills. The outline on this page is navigation only.
More ways to make it click.
Start with the first lesson, or choose a topic above.
Ask. Explore. Understand.
A teacher can help you see the idea from a different angle.
Try our interactive learning lab →Build understanding.
Then build confidence.
Start with the meaning of a field or potential, choose the right model, and explain the calculus you use.
You can bring schoolwork, a recent assessment, or the topic that is slowing you down. Your teacher can use that starting point to identify gaps and agree on a manageable plan.
What sessions can focus on
01 Electric charge, fields, and potential
02 Conductors and capacitors
03 Electric circuits
04 Magnetic fields and electromagnetic induction
A tutoring overview, not a complete course syllabus. Session content is matched to your schoolwork, level and goals.
Explore the official course or assessment information ↗
What a session can look like
- Review a recent attempt and the reasoning behind it.
- Work through one example with explanation and questions.
- Try a related problem independently and discuss what changed.
- Agree on practice and the next learning goal.
Before your first meeting
Have your course name, syllabus or current topic, a recent assignment, and preferred meeting times ready. For exam preparation, include your test date and a recent practice result if you have one.
Can tutoring follow my school’s class?
Yes. Share the syllabus, assignment instructions and upcoming assessments so the teacher can discuss an appropriate plan. Tutoring supports learning; it does not replace your school’s enrollment or assessment rules.
How do I choose the right teacher?
Tell us the exact course, grade, and timezone. Ask about the teacher’s recent experience with that subject, their approach, and available meeting times.
Are grades or scores guaranteed?
No. Progress depends on starting skills, practice, attendance, course demands and other factors. The plan should focus on specific skills and review progress honestly.
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