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.
Report Abuse. An inverter is used to convert DC power to AC. It can control the speed of an AC motor through varying the drive frequency. The AC power is converted to DC by means of a rectifier and re-converted on the inverter side back to AC.nverter is used to convert DC to AC form... just the opposite of rectifier which converts AC to DC... actually it's not solely related to motors but it is a part of an electrical system whenever it is needed..