How do low power draw devices not cause problems?

by TheCatWhisperer   Last Updated January 13, 2018 19:21 PM

Recently, a home owner tied a hot wire directly to a neutral and asked about it on this site. Fortunately, his unfortunate mistake did not result in anyone being injured. As an answers point out, usually a device drawing current reduces the load on the wires and prevents them from heating up.

However, this got me thinking... how to green and low power draw devices, such as a led bulb or cell phone charger draw enough current to prevent this from happening?

Are they less efficient than I imagine? Or need more current than I am thinking?

15 amps is a lot of current, and it does not seem to me that connecting a low power-draw device would be radically different than connecting a hot and neutral wire directly.

Why did directly connecting the hot and neutral wires in the linked question draw enough current to trip the breaker?

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