# Circuits / Electricity * [[Ohm's Law]] * [[Calculating Power]] ## Units of Measurement | Prefix | Symbol | Factor | | ------ | ------ | ----------------------: | | giga- | G | 1,000,000,000 = 10^9 | | mega- | M | 1,000,000 = 10^6 | | kilo- | K | 1,000 = 10^3 | | | _base_ | 1 | | milli- | m | 0.001 = 10^-3 | | micro- | µ | 0.000001 = 10^-6 | | nano- | n | 0.000000001 = 10^-9 | | pico- | p | 0.000000000001 = 10^-12 | ## Decibels (dB) Logarithmic scale when comparing two values. | Number in dB | Multiplier | | ------------ | ---------- | | 3 dB | Times 2 | | 6 dB | Times 4 | | 10 dB | Times 10 | > [!NOTE] Only the above 3 examples are needed for the test ## Parts ### Rechargeable Batteries: * Lithim-ion * Lead-acd * Nickel-metal hydride ### Circuit types * Resonant circuit * AKA Tuned Circuit and LC Circuit * Capacitor + inductor ### Capacitors Conductive surfaces separated by an insulator. ### Diodes Diodes have a (minimum) voltage drop in the voltage direction. It's lower in some diode types. ### Transistors * Consists of 3 layers of semiconductor material. * Primary gain-producing component in an RF power amplifier. It's the only component that produces gain. * Field-effect: * FET * Uses an electric field to control the flow of current. Commonly * Gate, drain, and source connectors