Unit 5 · 5 lessons
Electricity and Magnetism
Charge in motion, the three quantities that describe a circuit, how resistors combine, and the link between electricity and magnetism that powers the grid.
- 52 practice questions
- 57 flashcards
- 1 interactive lesson
Lessons
- 1Static Charge, Current and Electron FlowWhere charge comes from, what current actually measures, and why the direction everyone draws is the opposite of what the electrons do.10 questions
- 2Voltage, Resistance, Ohm's Law and Electrical PowerThe three quantities every circuit question is built from, the law that links them, and how a hydro bill is actually calculated.10 questions
- 3Series and Parallel CircuitsThe two ways to connect components, how resistances combine in each, and the current and voltage rules that follow.Interactive10 questions
- 4Magnetic Fields, Motors and TransformersHow a current creates a magnetic field, how that turns a motor, and how transformers make long-distance transmission possible.10 questions
- 5Household Circuits, Safety and Static in PracticeWhat is actually behind the wall — the panel, the three wires, breakers and GFCI outlets — why current rather than voltage is what harms you, and where static electricity shows up in real life.12 questions