No. It is amperage that does the damage. See the following list
Keep in mind 1000 milliamps equals 1 amp of current.
Less than 1/2 milliamp no sensation
1/2 to 2 milliamps Threshold of perception
2 to 10 milliamps Muscular contraction
5 to 25 milliamps Painful shock (may not be able to let go)
Over 25 milliamps Could be violent muscular contraction
50 to 100 milliamps Ventricular fibrillation
over 100 Paralysis of breathing.
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You can if you want to connect two 12 volt lights in series with each other. Make sure that the 12 volt lights are rated for AC and not DC.CommentFurther to the above answer, you must also ensure that the two lamps have identical power ratings, or the lamp with the lower power rating will be brighter than the one with the higher power rating!
55/12=4.6
That is called a parallel connection and will double the power if the batteries is the same size and the same voltage, the voltage will be the same as one battery, so if it is two 12 volt batteries the voltage will be 12 volt. It is dangerous to connect two batteries of different voltage in parallel like a12 volt and a 6 volt the 6 volt will then draw current from the 12 volt and it can overheat and even explode.
With an appropriately rated DC to DC converter.
No, it will cause the bulb to blow. A 12 volt light is DC voltage and your home outlet is AC voltage.