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Helpful online services, calculators
Table of contents
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Ohm's law
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Capacitance conversion (pf-nf-mf)
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Resistance. Resistors.
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Wire size conversion AWG to millimeters
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Electronic circuit design and simulator
1. Ohm's law
Very useful cheat sheet for converting Ohm's law variables. I refer to it all the time, it helps a lot with calculations.
You can also use online calculators:

2. Capacitance conversion (pf-nf-mf)
The page also has a table with digital codes (CODE value) written on the capacitor surface and its equivalent capacitance value.
3. Resistance. Resistors
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Online calculator for calculating the current-limiting resistor for a light-emitting diode (LED).
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Calculation of resistance in parallel and series connections of resistors.
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Online resistor parameter calculator by color code (select from the drop-down menu)
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SMD resistor value lookup by code marking
5. Electronic circuit design and simulator
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EveryCircuit - circuit simulator tool
- Scheme it - circuit design tool
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