background
building
cable
connect
connection
connector
conservation
cord
current
device
double
efficiency
electric
electrical
electricity
energy
equipment
european
generation
gray
grayscale
grey
grounded
home
house
illustration
insert
interior
isolated
light
line
network
nobody
object
plastic
plug
plugged
power
simple
socket
supply
technology
tool
two
type
voltage
wall
white
wire