Without electricity, practically nothing works, from appliances and lights to computers and air conditioners. Even some types of phones and heating equipment become worthless. Electricity is integral to our way of life.
A home’s electrical system includes incoming power lines, an electric meter, a service panel, subpanels, household wiring, electrical boxes, receptacles (outlets), switches, and, of course, the appliances, lights, and equipment that put the power to work.
But, if you follow expert instructions and turn off the power to circuits and devices before working on them, you can do this type of work safely. Low-voltage wiring for cable television, speakers, and security systems is very safe for do-it-yourselfers to handle.
This section of HomeTips offers information and instruction on a house’s electrical system.
To safely work on your home’s electrical system, you need the right tools. All are common and inexpensive. In theElectrical Tools Buying Guide, we take you through 8 tools that will allow you to work on virtually any electrical repair or project.
A home electrical system is an intricate maze of wiring designed to deliver power from a local utility to your home safely and efficiently.How a Home Electrical System Works是一个概述，其中包括各种组件及其所使用设备的图表。
If you have any discomfort working with your electrical system, you should not hesitate to call in a professional. Still, if your system is having problems, you may be able to easily troubleshoot the cause. InTroubleshooting Home Electrical Problems, we detail the most common problems and how to diagnose them.
Electrical current travels in a continuous closed path from the source (your home’s electrical panel) through a device that uses the power, such as a light, and then back to the source.
但电力没有流过电线for the return trip to the source. It can return to the source through any conductor—including a person. The conductor just has to contact the earth directly or touch a conductive material (such a water or metal) that goes to the earth.
If you accidentally become the conducting link in an electrically live circuit, you’ll get a shock—or worse.
You can get an electrical shock if you are touching a live wire or device at the same time you’re touching a grounded object (or another live wire).
This may sound unlikely, but if you’re touching any metal plumbing fixture, standing on the ground or anything connected to the ground, on a damp patio, or with your feet in water, you’re in contact with a grounded object. That’s when you’ll get a shock if you touch a live wire.
Always make sure that the circuit you intend to work on is not turned on…then you won’t have to worry whether or not you are going to become a conductor.
Even if you have no desire to work on your electrical system, for safety reasons you should know how to turn off the electricity to your house. Fortunately, it is an easy process, detailed in如何关闭房屋的电力。
Part of your home’s electrical system functioning safely is having the capacity to power all the appliances and devices you have or plan to purchase. We show you how to calculate your home’s energy usage. Then, in如何映射房屋电路，我们讨论为什么要了解房屋的电气系统是个好主意。
How much current moves through a wire in one second is measured in amperes. Basically, the larger the size of wire, the greater the ampere capacity. This unit is based on the number of electrons flowing past a given point per second.
Any conducting body, such as a metal cold-water pipe or a metal rod driven solidly into the earth, that gives electrical current a path to the ground.
导体that grounds a metal component but does not carry current during normal operation.
Ungrounded conductor carrying current forward from the source. Usually identified by black or red insulation, but may be any color other than white, gray, or green.
Unit used for metering and selling electricity. One kilowatt-hour equals 1,000 watts used for one hour.
地面ed conductor that completes a circuit by providing a return path to the source. Neutral wires are always identified by white or gray insulation.
A connection of three or more electrical wires.