box

clean

collection

construction

consumption

control

counter

current

digital

display

electric

electrical

electricity

electronics

element

energy

engineering

equipment

fixed

fuel

graduation

home

illustration

industrial

industry

instrument

isolated

kilowatt

machine

measurement

meter

needs

number

panel

power

price

pump

rate

reading

residential

scale

science

service

set

supply

technology

tool

voltage

watt