Currents
Learn the complete H1 Physics 8867 Currents scope through clear explanations, worked methods and purposeful practice.
Learning goals
- Relate current to charge flow, number density and drift velocity.
- Apply potential difference, e.m.f. and electrical power relationships.
Before you begin
Start with the first lesson if this topic is new. If you are revising, use Check your understanding to find the lesson that deserves your attention, then work from the explanation to supported and independent practice.
Be comfortable with: Circular Motion and Gravitation
How the ideas connect
- Current, charge flow and drift velocity
- Potential difference and electromotive force
- Electrical power
Learn in order
Lesson route
Learn the topic
- 01Current, charge flow and drift velocityCurrent measures charge flow rate. The drift model connects that circuit-scale quantity to the slow average motion of many charge carriers.35 min
- 02Potential difference and electromotive forceVoltage is energy transferred per unit charge. E.m.f. describes energy supplied to charge; potential difference describes energy transferred from electrical stores.35 min
- 03Electrical powerElectrical power is the rate at which a component transfers energy. P = VI is general; the resistance forms follow when V = IR applies at that operating point.35 min
Check your understanding
Practice and check
What you will learn
These lessons cover the complete H1 Currents scope in a deliberate order.
- Use I = Q/t for steady or average current.
- Derive I = nAvq from a carrier model.
- Use V = W/Q in calculations.
- Distinguish e.m.f. and p.d. using energy rather than calling either a force.
- Use P = VI for electrical energy transfer.
- Select P = I²R or P = V²/R for a resistive component.
Syllabus and review details
Covers the complete 2027 H1 Physics 8867 requirements for Currents; H2-only extensions are deliberately left out.
Use written working, labelled diagrams and clear physical reasoning as well as final answers. The lesson questions are designed to prepare you for both calculations and explanations.
Curriculum and content checked 2026-09-14
Frequently asked questions
Where should I start in Currents?
Start with Current, charge flow and drift velocity. The 3 lessons build in order, and each one ends with an independent question and a clear next step.
How should I use the worked examples?
Cover the steps, attempt the question first, then compare your method line by line. Check the sign, direction, unit and size of your result.
What should I do when I finish the lessons?
Use Check your understanding, revisit any weak lesson, then complete the practice plan without looking at the worked answers.
Course and syllabus information
- Course
- GCE A-Level H1 Physics
- Edition
- GCE A-Level H1 Physics 2027