activity
background
bright
building
button
closeup
concept
conceptual
conservation
control
design
dirty
economize
electric
electricity
energy
environment
equipment
finger
hand
home
house
household
human
index
indoor
interior
isolated
light
man
movement
off
plastic
plug
point
power
power on
press
push
receptacle
receptor
rescue
room
save
start
supply
switch
turn
turn on
wall