Thank you for your question, Emily. It is both voltage and the current (amps) that are significant. Think of volts as pressure. First, there must be enough pressure (voltage) to push current through the body. Second, there must be enough current (amps) to do damage. “Danger, High Voltage” signs are to say that there is enough voltage to potentially cause current to leap from the power cables to your body and then then to ground. That there is enough current (amps) in the system to cause damage is taken as a given. I hope this helps, but please ask further.