| f, symbol for frequency | AC Inductor Circuits |
| Factor, conversion | Metric prefixes and unit conversions |
| factor, power | Power in resistive and reactive AC circuits |
| Factoring | Algebra Reference |
| Fail-safe design | Fail-safe design |
| | Programmable logic controllers |
| Failure mode, zener diode | Zener diodes |
| fan-in | Larger 5 & 6-variable Karnaugh maps |
| farad | Electric fields and capacitance |
| | AC Capacitor Circuits |
| Faraday's Law | Inductor commutating circuits |
| Fast Fourier Transform | Square wave signals |
| | Power quality measurement |
| Fault, ground | Troubleshooting -- Theory and Practice |
| | Shock current path |
| FDDI | Extended-distance networks |
| feedback | Positive feedback |
| | Introduction |
| | Precision voltage follower |
| feedback, amplifier | Feedback |
| Feedback, negative | Negative feedback |
| | Common-Emitter Amplifier |
| Feedback, positive | Logic signal voltage levels |
| Femto | Metric notation |
| Ferrite | Permeability and saturation |
| | Inductor quirks |
| Ferromagnetism | Permanent magnets |
| Ferroresonant transformer | Voltage regulation |
| Fetch/execute cycle | Microprocessors |
| FFT | Square wave signals |
| | Power quality measurement |
| field flux | Electric fields and capacitance |
| | Magnetic fields and inductance |
| | Permanent magnets |
| field force | Electric fields and capacitance |
| | Magnetic fields and inductance |
| | Permanent magnets |
| field intensity | Magnetic units of measurement |
| Field intensity, magnetic | Historical, nonmechanical memory technologies |
| field winding, alternator | Automotive alternator |
| field, electric | Electric fields and capacitance |
| | An electric pendulum |
| | Principles of radio |
| Field, magnetic | Magnetic fields and inductance |
| | An electric pendulum |
| | Principles of radio |
| Field-effect transistor | Voltmeter impact on measured circuit |
| | pH measurement |
| Fieldbus | Extended-distance networks |
| filter | What is a Filter? |
| | Low-Pass Filters |
| | High-pass filters |
| | Band-pass filters |
| | Band-stop filters |
| | Resonant filters |
| | Applications of resonance |
| | Rectifier/filter circuit |
| Filter choke | Rectifier/filter circuit |
| Finite state machine | Finite-state machines |
| Firewire | Short-distance busses |
| firing | The Shockley Diode |
| Flash ADC | Flash ADC |
| Flash converter | The "operational" amplifier |
| Flash memory | Modern nonmechanical memory |
| flip-flop | Introduction to Shift Registers |
| flip-flop vs. latch | Edge-triggered latches: Flip-Flops |
| Flip-flop, J-K | The J-K flip-flop |
| flip-flop, SR | Edge-triggered latches: Flip-Flops |
| Floating | The transistor as a switch |
| Floating input, defined | The NOT gate |
| | Basic gate function |
| | LED sequencer |
| Floating inputs, CMOS vs. TTL | CMOS gate circuitry |
| Floppy disk | Memory with moving parts: "Drives" |
| flow switch | Switch types |
| flow, electron vs. conventional | Conventional versus electron flow |
| | Introduction |
| flux density | Magnetic units of measurement |
| Flux density, magnetic | Historical, nonmechanical memory technologies |
| Foam, anti-static | Meter check of a transistor |
| Force, magnetomotive | Electromagnetism |
| forced commutation | The Silicon-Controlled Switch (SCS) |
| Form factor | Measurements of AC magnitude |
| FORTH | Microprocessor programming |
| FORTRAN | Microprocessor programming |
| FORTRAN, computer language | Using the Spice Circuit Simulation Program |
| forward bias | Introduction |
| forward voltage, diode | Diode Characteristic |
| Forward voltage, PN junction | The NOT gate |
| four-layer diode | The Shockley Diode |
| Four-wire resistance measurement | Kelvin (4-wire) resistance measurement |
| Fourier analysis | Square wave signals |
| Fourier Transform | Square wave signals |
| Free electron | Conductors, insulators, and electron flow |
| Frequency | Ohm's Law (again!) |
| | AC Waveforms |
| | Frequency and Phase Measurement |
| | Musical keyboard as a signal generator |
| Frequency domain | Waveform analysis |
| frequency meter | Frequency and Phase Measurement |
| frequency modulation | Electrical signal types |
| Frequency response, op-amp | Frequency Response |
| frequency shift keying | Electrical signal types |
| Frequency, fundamental | Standing waves and resonance |
| Frequency, Nyquist | Practical considerations of ADC circuits |
| FSK | Electrical signal types |
| FSM | Finite-state machines |
| fuel cell | Fuel Cell |
| full-adder | Full-Adder |
| Full-bridge circuit | Strain gauges |
| Full-wave rectification | Other waveshapes |
| | Full-wave center-tap rectifier |
| full-wave rectifier | Rectifier circuits |
| Function generator | Musical keyboard as a signal generator |
| Fundamental frequency | Standing waves and resonance |
| | Introduction |
| | Waveform analysis |
| Fuse | Safe practices |
| | Fuses |
| | Ammeter usage |
| fuse, slow-blow | Transformer -- power supply |
| fusible link | Fuses |
| Fuzzy logic | Introduction |
