Electronic diagrams collection 001 focuses on basic component properties in diagram form for those who want little text.
Electronic diagrams collection 002 Focuses on transistor and their basic circuits.
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Basic component and multimeter measurement schematic symbols
Most topics here are covered in more detail at 001 Resistive component multimeter voltage-current-resistance measurements
Common appearance of single cell cylindrical battery
More switch schematic symbols
Open and closed circuits
Single supply ground
9 volt batteries like this are typically alkaline. Internally, they have six 1.5V cells connected in series. There is a so called 9V lithium ion battery, in the same package, that has a couple of internal 3.6V cells (4.2V fully charged) for 8.4V when fully charged.
Series alkaline batteries
Always make sure that series batteries have about the same voltage/charge and capacity (Ah/mAh), for even and safer discharge and recharge if rechargeable.
Resistor color code
Those values above are rare, more common are…
Some more schematic symbols
Multimeter measurement locations and IV linear relationship of resistors
Parallel resistors have an equivalent of less resistance (more current passed)
Indicator LED schematic symbol in relationship to physical component
Different ways to draw a schematic of the same simple circuit
One way to build a simple LED protected by a resistor circuit on a breadboard
LED needs less protective resistance when powered by 5V instead of 9V
A voltage and current that change direction, can be redirected (rectified) into conducting in one direction at another part of the circuit. Rises and falls of voltage can be smoothed with a capacitor.
Series components split up/divide the voltage across them. Resistors do so proportionally:
Common component variations schematic symbols
Some light dependent resistor adjustment techniques
Explained in YouTube video How to set a minimum and maximum possible resistance for light dependent resistor LDR and webpage Light Dependent Resistor LDR component – Photoresistor
Zener diode and full wave bridge rectifer basics
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