当你购买灯具或烤面包机时，“UL认证”标志提供了一个保证，它确保该电器可以和你家墙上的插座相匹配，并且兼容你家中的整个电气系统。

When you purchase a lamp or a toaster, the "UL Certified" mark provides assurance that the appliance will plug into the socket in your wall and work with your home's electrical system.

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您可以使用备用插座，测试不同的分立元件值。只须维持规范的是在电路兼容，以及完成这项工作。

You can use spare sockets to try out different discrete component values. Just keep the ones that are spec-compatible in the circuit, and get the job done.

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