Maybe the power source...
Overload - excess voltage causes excess current, and the combination causes excess power dissipation, leading to overheating. If the varistor was included to help dampen voltage surges, then a very "dirty" supply. with large numbers of surges, can lead to overheating.
Most electronic devices have maximum voltage or current ratings, so if you exceed these maxima, you can expect them to breakdown...ie: Malfunction. Most breakdowns are permanent, so removing the excess voltage or current will not cause them to recover.
A bad flare can induce excess voltage in the power lines, which can cause the the power plant to shut down, or even get damaged
the difference between a voltage converter to a voltage regulator,is that a voltage converter,converts or changing the desired voltage to be used while the voltage regulator,regulates the input of the voltage amount not to excess to its inputs.
I think the cause of ripple voltage would be from a bad ground or capacitve voltage.
Let's be quite clear about this. Excess application of manure DOES cause pollution.
It is the rated test voltage that will not cause insulation breakdown.
Yes, a corroded battery can cause an intermittent voltage drop.
To prevent excess voltage to enter in a diode or LED etc
calcium
yes.
In excess, possibly.