ac
adapter
background
battery
box
car
charge
circuit
closeup
computer
connector
control
convert
converter
current
dc
device
electric
electrical
electricity
electronic
emergency
energy
energy crisis
engineering
equipment
factory
frequency
generator
industrial
industry
inverter
inverters
isolated
metal
plug
power
power supply
socket
solar
supply
switch
technology
universal
usb
variable
voltage
watt
white