The specification for USB connectors requires them to provide 5 volts at up to 500 mA. So about 2.5 watts. Thus it is possible to power a small LED light bulb with a USB lead.
No, a lamp will not work if you disconnect it from the wall outlet. The outlet provides the electrical power necessary for the lamp to function, so without that connection, the lamp has no source of electricity. Even if the lamp is plugged in but turned off, it still requires a connection to the outlet to operate.
check the earth connection at the lamp clusters
It would depend on the particular unit, the monitor and their connection options; but generally yes they can usually be combined - sometimes requiring an adapter to connect one to the other.
Blown lamp or fuse. Poor connection. Switch not working. Break in circuit
it will work but the light output will be markedly reduced.
An oil or kerosene lamp. A candle would work too.
Yes. If the plug (cap) end of the 250 volt lamp is compatible to the receptacle the lamp would work. The light output of the lamp would not be very bright. Because the working voltage is halved so would the light output.
Typically, if the ballast on a fluorescent light blows, the lamp will not work. The ballast regulates the electrical current to the lamp, so if it is not functioning properly, the lamp will not receive the correct power to light up.
The main subsystems in a lamp are the electrical system (power cord, socket, switch, and bulb), the shade or diffuser that covers the bulb, and the base that supports the lamp. These subsystems work together to provide illumination and functionality to the lamp.
A good type of office light which will light up your work are but not the space around you would be a desk lamp. Another good idea would be to put a low wattage fluorescent bulb in the lamp as it will provide a better light, at a much lower cost.
- Damaged or burnt wiring - Bad or corroded earth connection in the brake lamp cluster - Failed bulbs. (although it's unlikely that all your brake lights have blown) You can use a meter and a volunteer to check that power is reaching the bulb holder. If power is reaching the bulbs and they are working, then a bad earth connection may be the cause. Corrosion around the lamp cluster is a common cause of this. There may be problems with the other lights if the vehicle has a shared lamp cluster At any rate, it wouldn't do any harm to let a vehicle electrician take a look
“my dishtv connection is not work”