UK term : USA term

Allen Key : hex key , hex wrench, Allen wrench
Anglepoise lamp : Luxo lamp
anode voltage (valves) : plate voltage, "B battery" (tubes)
answerphone : answering machine
anti-clockwise : counter-clockwise
Araldite (epoxy glue) : J B Weld, Scotch-Weld 
Avo (meter, short for Avocet and amps,volts,ohms )  [old analogue multimeter ] : VTVM (vacuum tube voltmeter; usually line-powered) or a VOM (volt-ohmmeter; usually battery-powered) / Simpson
Bakelite : Catlin, Catalin
banana plugs : wander plugs
barrel fuse : Buss fuse
billion (before year 1974 ) : million million
(the) box, telly : television (set)
Bulgin connectors : Buccaneer?
bungee cord : flex cord, flex strap
earth [voltage reference] : ground
( earth removal see note as no UK equivalent ) : ground buster / groundbuster 
note; groundbuster is an adaptor
that simply converts a 3 prong USA AC plug into a 2 prong.
In the UK they don't exist as such , the third earth/ground pin is needed to
open the safety, sliding shrouds, covering the powered sections of the socket.
"wall warts" for the UK always seem to have plastic earth/ground pins which
have to be there as dummies so you can physically plug them into UK power
sockets. Generally, commonly called "square pin" plugs and sockets 
although rectangular in cross-sections of pins. The 3 pin structure 
also avoids the situation of a drunk/poor-sighted person pushing a 2 pin 
plug into a raised socket , but only one pin engaged leaving the 
other one external and exposed, carying live voltage, via the equipment.
Dexion : slotted angle
EHT (Extra High Tension) (higher than high tension) : no generic USA equivalent other than maybe +HV instead of HV
elastic band : flex cord
enameled copper wire : magnet wire
engineer's persuader for percussive maintenance : knockometer
filament voltage (valves)  : "A battery" (tubes)
flex : electric cord
Gilbows : tinsnips, sheet metal shears
grid bias (valves) : "C battery" (tubes)
Handy Angle : slottend angle
Harwin/Molex connectors : Amp/Tyco
Hellerman pliers ,(triple prong, rubber sleeving, expanders), (honeymoon pliers ) : sleeving pliers
high tension (HT)  : high voltage (hv), B+
imperial (measurements ) : inches,feet,yards,miles
inexpensive and commonly available (transistor) : jellybean (transistor)
jack : plug (male part of a connection)
Jubilee clip : worm drive hose clip 
LOPT , Line Output Transformer (pronounced Lop-tee) : IHVT (Flyback Transformer) , IFBT = Integrated FlyBack Transformer,flyback transformer, FBT
mains (power) [electricity supply company power feed ] : line (power), utility power
maths (mathematics ) : math
metric (measurements, mm ,cm, metres,km) : European
mobile (phone) : cell, cellphone, wireless, cellular phone
Mole grips : lock jaw pliers, Vice Grips
no UK term equivalent : vampire device = anything that continues to draw power even when in the 'off' state, eg wall wart etc
Paxolin : paper phenolic 
Perspex : Plexiglas , Lucite
phono connectors : RCA connectors (archaic) 
pilewound (as in a coil) : scatterwound
plug in power supply : wall wart, ac adapter
plugs and sockets (male and female designated by forms of outer housing ) : plugs and sockets (male and female designated by forms inner electrical connections ) 
power point : electric socket, electrical outlet, 
QM connectors : Burndy,  QikMate 
Q-Max cutter : Greenlee punch
RCCD,Residual Current Circuit Device/ELCB Earth Leakage Circuit Breaker : GFCI Ground Fault Circuit Interrupter
reaction : regeneration
ring spanner : box wrench
rubber (hard formulation) : Ebonite
spanner : wrench
scope (oscilloscope) : o'scope, oscope, waveform analyzer
screening : shielding
socket : jack (except for mains wall outlets, should be a "Jill" surely )
Stanley knife , craft knife : box cutter , utility knife, Skil knife, razor knife
stickers, transfers : decals
Stilsons : pipewrench
thou (thousandth of an inch ): mil (measurement)
trannie/tranny: transformer or transistor according to context
trillion (before 1974 ? ) : million million million
vacuum tube : electron tube
(thermionic) valve : tube
Vero board ,copper strip matrix board : Vector board, Perfboard?
video : vcr (machine)
white goods : appliances
wireless : radio


Australia : USA

shifter (shifting spanner) : adjustable wrench
wheel nuts : lug nuts
wheel brace : lug wrench


A few synonyms of sort
Low Copper, High Oxygen Content Connection =  High Impedence Air Gap  = unplugged

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