A tendency to suffer allergies is often hereditary. The most common causes of hay fever are: tree pollen such as elder, elm, hazel and especially birch (spring hay fever) grass pollen (summer hay fever) mugwort and hybrids such as chrysanthemum (autumn hay fever)
A power inverter, or inverter, is an electronic device or circuitry that changes direct current (DC) to alternating current (AC).The input voltage, output voltage and frequency, and overall power handling depend on the design of the specific device or circuitry.he AC output voltage of a power inverter device is often the same as the standard power line voltage, such as household 120 VAC or 240 VAC. This allows the inverter to power numerous types of equipment designed to operate off the standard line power.
An inverter changes direct current to alternating current. All computers use both AC (alternating current) and DC (direct current). On a laptop computer the devices that use AC current are the cooling fan, floppy drive, hard disk drive, CD-ROM or DVD drive and the backlight for the LCD panel.owever, laptops run on DC (battery) voltage. Therefore, the inverter is required to convert that DC to AC to light the backlight. In your case, the inverter probably is bad, especially if the laptop is relatively new, but the fluorescent backlight itself can also burn out.