Electricity and Magnetism
Analyse circuits, power, fields, motor and generator effects, induction, transformers and transmission.
How to prepare for the current ESAT
Confirm your course combination, build no-calculator fluency from Mathematics 1 upward, and use official Pearson materials for authentic timing and interface rehearsal.
Core concepts
Concept 1
Apply charge, current, voltage, resistance, power and energy relationships to series and parallel circuits.
Exam cue: Draw or simplify the circuit before applying a rule.
Concept 2
Interpret magnetic fields, force on a current and motor-effect direction.
Exam cue: State field, current and force directions separately.
Concept 3
Explain induction, generators, transformers and high-voltage power transmission.
Exam cue: Use conservation of power only with the stated efficiency assumption.
Risk pitfalls and guardrails
Putting a voltmeter in series or ammeter in parallel.
Guardrail: Do not use calculator-dependent shortcuts, import a fact outside the annual specification or overlook a unit, sign, scale or course-module boundary.
Treating current as used up by a component.
Guardrail: Do not use calculator-dependent shortcuts, import a fact outside the annual specification or overlook a unit, sign, scale or course-module boundary.
Reversing primary and secondary quantities in transformer ratios.
Guardrail: Do not use calculator-dependent shortcuts, import a fact outside the annual specification or overlook a unit, sign, scale or course-module boundary.
Memory anchors
Current
I = Q/t, the rate of charge flow.
Resistance
R = V/I.
Electrical power
P = IV = I²R.
Series current
The same current passes through series components.
Motor effect
A current in a magnetic field can experience a force.
Transformer
Vₛ/Vₚ = nₛ/nₚ for an ideal transformer.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
3.0 A flows for 40 s. Charge?
12 V across 4.0 Ω gives current?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
What is Pass Harbor?
Completely free exam prep for 247 UK exams.
- Practice questions
- Flashcards
- Study guides
- Mock exams
- No registration
- No paywall
- Start instantly
“No more expensive exam prep. Quality study tools should be accessible to everyone.”