Level 1 Electrical Science revision notes for electrical learners. 14 pages on SI units, Ohm’s law, power formulas, circuits, symbols and quick-fire facts.

These notes cover the Level 1 Electrical Science course one week at a time. They’re written in plain language with clear tables and worked examples, so learners can follow every calculation step by step. They were written by a practising electrician and college lecturer, so the science is always linked to real electrical work.

What’s covered:

Week 1 – Units of measurement: SI units, area, volume, density, mass vs weight, and temperature in kelvin
Week 2 – Electrical units: volts, amps, ohms and watts, plus prefixes (mega, kilo, milli, micro) and how to convert between them
Week 3 – Ohm’s law and power: V = I × R, the power formulas, and the heating, magnetic and chemical effects of current
Week 4 – Circuit principles: electron flow vs conventional current, d.c. and a.c., and UK mains at 230 V / 400 V, 50 Hz
Week 5 – Conductors and insulators: copper, aluminium and steel, PVC and XLPE insulation, sources of e.m.f., and measuring voltage
Week 6 – Series and parallel circuits: working out total resistance, current and voltage, and using meters correctly
Week 7 – Diagrams and drawings: block, circuit, wiring and layout diagrams, and what each one is used for
Week 8 – Graphical symbols: the standard symbols you need to recognise
Week 9 – Typical domestic circuits: lighting, ring final and radial circuits
Week 10 – Practical assessment: worked examples of measuring and calculating