apartment
appliance
background
building
bulb
button
conservation
control
current
design
device
domestic
economy
electric
electrical
electrician
electricity
energy
environment
environmental
equipment
european
group
home
house
household
indoors
industry
interior
lamp
light
line
modern
nobody
off
plastic
power
room
savings
simple
supply
switch
technology
turn
turning on or off
two
wall
white