A <b>Metal Oxide Varistor</b> or <b>MOV</b> in a <a href="//commons.wikimedia.org/wiki/Power_supply" class="mw-redirect" title="Power supply">power supply</a> circuit board (blue disc shaped component). A <a href="//commons.wikimedia.org/w/index.php?title=Varistor&amp;action=edit&amp;redlink=1" class="new" title="Varistor (page does not exist)">Varistor</a> is a type of resistor whose electrical resistance varies with the applied voltage. In this power supply circuit, it is used to protect the circuit from voltage spikes. Note the traditional varistor symbol printed on the <a href="//commons.wikimedia.org/w/index.php?title=Printed_circuit_board&amp;action=edit&amp;redlink=1" class="new" title="Printed circuit board (page does not exist)">printed circuit board</a> (PCB).
<a href="//commons.wikimedia.org/wiki/User:Soumyapatra13" title="User:Soumyapatra13">Soumyapatra13</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>