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.
In electronics, an inverter can be defined as a device for converting direct current (DC) power into alternating current (AC). An example of an inverter is the adapter used in cars for converting the low voltage cigarette lighterâs power (DC) into mains equivalent voltage (AC).This allows the use of many types of household electrical devices while on the road. In a laptop, an inverter is often used to light the computer's screen.A laptop inverter is a small circuit board, usually about the size of a pen. Internally, a laptop runs on a low voltage, with the exception of the screen, which uses a backlit liquid crystal display (LCD).Without the inverter and the bulb it powers, the screen would be too faint to see properly.n a laptop, an inverter is often used to light the computer's screen. A laptop inverter is a small circuit board, usually about the size of a pen.