| f-number |
f 數，光圈數 |
| f-stop |
f 制光圈 |
| far point |
遠點 |
| farad |
法拉 |
| Faraday constant |
法拉第常數，法拉第常量 |
| Faraday' s law of electromagnetic
induction |
法拉第電磁感應定律 |
| fast breeder reactor |
快中子增殖反應堆 |
| feedback |
反饋 |
| feedback amplifier |
反饋放大器 |
| feedback resistance |
反饋電阻 |
| ferromagnetic substance |
鐵磁性物質 |
| ferromagnetism |
鐵磁性 |
| fictitious force |
假力，偽力 |
| fidelity |
保真性，保真度 |
| field coil |
場線圈 |
| field effect transistor |
場效應晶體管 |
| field intensity |
場強 |
| field lines |
場力嶋 綫 |
| field magnet |
場磁鐵，場磁體 |
| field of view |
視場，視野 |
| field strength |
場強 |
| figure of merit |
優值，靈敏值 |
| filament |
燈絲，絲極 |
| filter capacitor |
濾波電容器 |
| filter circuit |
濾波電路 |
| filter pump |
濾泵 |
| final state |
終態，末態 |
| final velocity |
末速度 |
| fine-adjustment |
微調，細調 |
| fire alarm |
火警警報器，火警鐘 |
| first law of thermodynamics |
熱力學第一定律 |
| first order spectrum |
第一級光譜，第一級譜 |
| fission |
裂變 |
| fission reactor |
裂變反應堆 |
| fixed point |
定點 |
| fixed pulley |
定滑輪 |
| fixed resistor |
定值電阻器 |
| flat coil |
扁平線圈 |
| flat solenoid |
扁平螺線管 |
| flat-bottomed flask |
平底燒瓶 |
| Fleming' s left hand rule |
弗林明左手定則 |
| Fleming' s right hand rule |
弗林明右手定則 |
| floating body |
浮體 |
| fluid |
流體 |
| fluid dynamics |
流體動力學 |
| fluorescence |
螢光 |
| fluorescent screen |
螢光屏，螢光幕 |
| flux |
通量 |
| flux density |
通量密度 |
| fly-back |
回掃 |
| flywheel |
飛輪 |
| focal length |
焦距 |
| focal plane |
焦平面 |
| focus |
焦點，聚焦，對焦 |
| focus control |
聚焦控制 |
| follower circuit |
跟隨電路 |
| foot pump |
腳踏泵 |
| force |
力 |
| force constant |
力常數，力常量 |
| force polygon |
力多邊形 |
| force resolution |
力的分解 |
| force triangle |
力三角形 |
| force-extension curve |
施力—伸長關係曲嶋
綫 |
| forced oscillation |
受迫振盪 |
| former |
框 |
| forward biased |
正向偏壓 |
| forward current |
正向電流 |
| fossil fuel |
化石燃料 |
| Foucault' s rotating mirror
method |
傅科旋轉鏡法 |
| frame of reference |
參考座標系，參考系 |
| Franck-Hertz experiment |
弗蘭克—赫茲實驗 |
| Fraunhofer diffraction |
夫琅和費衍射，夫琅和費繞射 |
| Fraunhofer lines |
夫琅和費譜嶋 綫 |
| free electron |
自由電子 |
| free fall |
自由下墜，自由下落 |
| free falling body |
自由落體 |
| free oscillation |
自由振盪 |
| free path |
自由程 |
| free space |
自由空間 |
| freeze |
凝固 |
| freezing point |
凝固點 |
| freon |
氟利昂，二氯二氟甲烷 |
| frequency |
頻率 |
| frequency modulation |
調頻，頻率調制 |
| frequency response |
頻率響應 |
| Fresnel diffraction |
菲涅耳衍射，菲涅耳繞射 |
| Fresnel' s biprism |
菲涅耳雙稜鏡 |
| friction |
摩擦，摩擦力 |
| friction compensated |
補償摩擦作用 |
| frictionless motion |
無摩擦運動 |
| fringe |
條紋 |
| fringe pattern |
條紋圖形 |
| fuel rod |
燃料棒 |
| fulcrum |
支點 |
| full adder |
全加法器 |
| full-scale deflection |
滿標偏轉 |
| full-wave rectification |
全波整流 |
| full-wave rectifier |
全波整流器 |
| fundamental frequency |
基頻 |
| fundamental mode of vibration |
基諧振動模式 |
| fundamental note |
基音 |
| fundamental quantity |
基本量 |
| fundamental unit |
基本單位 |
| fuse |
保險絲 |
| fuse rating |
保險絲額定值 |
| fusion |
熔解，聚變 |
| fusion point |
熔點 |
| fusion reactor |
聚變反應堆 |
