Under Rated Power Source

Unless the Power Supply is properly protected (Fuses, Circuit Breakers etc) I would expect a few burnouts.

Doubling working load compared to the design load is going to do some damage.

Regards,
Sapper

You have a piece of equipment designed to supply 4 amps and you are asking it to supply 10 amps. If it has a fuse you will blow the fuse. If not you get fire and smoke.

Whar did you do about that last problem you had? The one about grounding.

Yes, if you use more than the power supply can supply on a continuous basis you will pass the limits of parts. Some parts, like fuses or circuit breakers will operate to turn the power off. If there is no fuse or circuit breaker protection then transformers, resistors, etc will over heat due to the extra power drain = heat and or smoke and in time failure due to burn out or combustion.

The alternative theory is the smoke theory. Parts are made with a certain amount of contained smoke. It is escapes, the equipment stops working...

Here are some similar questions in other fields which may help you understand:

• Can overloading a shelf make it collapse? i.e., What if I put 300kg on a shelf rated for 200kg? Will that damage the shelf?
• Can overloading a cargo plane cause the plane to crash? i.e. What if I try to take off in an aircraft rated for 1 million pounds fully loaded, with an actual gross weight of 2 million pounds? If I don't intervene to prevent damage (stop before the end of the runway), will that damage the aircraft?
• Can running full tilt into a brick wall head-first cause brain damage?