Derive before you simulate
Each concept starts from the governing equation and a hand-calculated component value. Simulation only checks the derivation.
Track · Basic Electronics
Basic electronics from the governing equation to the measured node voltage.
Voltage, current, resistance, power, dividers and RC behaviour — derived by hand, checked against a schematic, then verified on the bench. Values are computed live, not illustrated.
Scope
Basic electronics only
Method
Derive · build · measure
Units
SI, engineering notation
Mini workbench · resistive dividerlive
R1 (kΩ)10
R2 (kΩ)10
Vin (V)5
Vout = Vin·R2/(R1+R2)
2.500 V
I 0.250 mA · P 1.25 mW
CH1 vin · CH2 vout · 2 V/div50.0 % of input
Section 02 · Method
Every value is measurable
Each circuit is drawn so it can be built on a breadboard and probed, then compared against the predicted node voltages.
Tolerances are part of the answer
E-series rounding, resistor tolerance and power derating are treated as first-class design inputs, not footnotes.
Section 03 · Lesson index
Basic Electronics curriculum
Modules are ordered by dependency. Each lesson opens with a derivation and ends with a circuit you can measure on the bench.
- 01
LESSON 1: Introduction to Electronics & Ohm’s Law
Understand the difference between electricity and electronics, master the fundamental triumvirate (V, I, R), explore resistor physics and unit conversions, derive Ohm's Law, and build a protective Battery + Resistor + LED circuit.
25 min · BeginnerStart Lesson - 02
LESSON 2: Series and Parallel Circuits
Identify series and parallel connections, explain how current paths differ, and build simple lamp circuits.
20 min · BeginnerStart Lesson - 03
LESSON 3: Voltage Dividers & Sensor Interfacing
The resistive voltage divider equation, input impedance, loading errors, and interfacing LDRs and thermistors to ADCs.
22 min · IntermediateComing soon
Section 04 · Interactive workbench
Basic electronics calculators
Live tools for the fundamentals. Enter measured or specified values; results update as you type.
Tool 01 · Resistor colour codeIEC 60062
Bands
1 kΩ±5%range 950 Ω … 1.05 kΩ
Band 1 · digit
Band 2 · digit
Multiplier
Tolerance
Tool 02 · Ohm's law matrixV=IR · P=VI
Select two known quantities
Voltagegiven
5V
V = I·R = √(P·R)
Currentsolved
22.73mA
I = V/R = P/V
Resistancegiven
220Ω
R = V/I = V²/P
Powersolved
113.6mW
P = V·I = I²·R
Notes
DC / resistive case only. For a real part, check the dissipation above against the package rating — a 0603 chip resistor derates to roughly 100 mW at 70 °C.