When the power goes out, it is no surprise that many people call an electrician. However, you may not need an electrician. Some basic troubleshooting may get your power either back up without assistance, or significantly reduce your electrician bill if you need to call in a professional.
Electricity can be deadly if misunderstood. If at any time you feel uncomfortable, you should call a professional.
Electricity Super-Basics
Electricity is just like water in almost every way. Regardless of whether you are using a battery, car, or home source, power flows from positive to negative, just as water flows downstream from up (high potential/positive) to ground (low potential/negative). Put a battery in your flashlight, and the charge flows from the positive (+) end of the battery to the negative (-) end of the battery. The light bulb between is a "resistor," and that resistance creates the power to turn the light on, just as a dam can be used to turn a waterwheel when placed in a stream. Just like a stream, when a resistor requires more power, it requires more "current," and the larger the current, the larger the wiring required to power that resistor, just as a larger stream is required to accommodate more water to power a waterwheel. Connecting the positive (+) to the negative (-) discharges the battery, just like connecting a stream to itself stops the water from moving. anywhere.
Never connect positive directly to negative, and definitely do not cross the streams. It would be bad. Try to imagine all life as you know it stopping instantaneously and every molecule in your body exploding at the speed of light.
Total protonic reversal.
The Breaker Box
Electricity is generated using unicorn horns and fairy dust to power turbines at the electrical company, which is then distributed to homes and business through power lines either above- or below-ground depending on your neighborhood. The power is extremely high voltage in those wires, meaning high potential, as mentioned earlier. That high voltage is more dangerous than what is in your house, because the power is "transformed" to 220 Volts before going into your home. The power cable goes through your home's outer wall and inside directly to the breaker box. NEVER mess with the wiring between the breaker box and the street. You work downstream from the breaker box within your home, or not at all.
The breaker box protects you and your home from electrical fires and shorts, and distributes power throughout your home. The breaker box is typically a rectangular box filled with two rows of either circuit breakers or fuses. If your home is very old, it is filled with glass fuses. The circuit inside the glass fuse will explode - requiring replacement - if you draw too much current with your 1,000 Watt PC and home theater system, or if you inadvertently create a close circuit, meaning you accidentally connected your positive to your negative, which can happen many different ways through accident or intention. Make sure if it happens it is by accident.
Most homes have circuit breaker boxes, however, which can be reset by flipping a switch rather than replacing a fuse. If your home is old enough to have a fuse box rather than breakers, you may want to consider the expensive task of upgrading to breakers and having your wiring inspected for safety.
Before you lose power, familiarize yourself with your fuse or breaker box. Each fuse or breaker should be labeled with a corresponding room or rooms. If you have breakers, it might even be worth checking by flicking off each individual breaker and checking the wiring in your home to make sure it is labeled correctly if you did not label them yourself. A mislabeled breaker can create hours of additional work diagnosing a problem.
You, too, can master the power of electricity
First diagnosisIf and when you do lose power, check your circuit breaker or fuse box to ensure no fuses have blown or that no breakers have been, "tripped." If they have, turn off any high-powered electronics on that circuit, then try turning it back on by replacing the fuse or flipping the breaker into the, "on" position. If the fuse blows immediately or the breaker trips again, you have what is called a, "short" in the power line somewhere. This is generally something you have plugged in that has a short inside itself somewhere, because you have been rewiring, a child has inserted a fork in the outlet, or similar situation. Try unplugging everything on that circuit (you did label the circuit correctly, right?), then try turning the power back on again.
If the power comes on, congratulations, it's something you either plugged in or turned on. For example, if every time you flick on the ceiling light it trips a breaker, the problem is between the switch and the light, so you need to focus on those areas. Take the wall plate off the switch and check the wiring. You can also check the lamp or light to see if something has shorted.
Second diagnosis
If the circuit breaker does not trip but you do not have power, the problem is an "open" circuit, meaning a wire is either split or disconnected somewhere. Most commonly is when a GFCI (ground fault circuit interrupter) clicks in a bathroom socket, the one with the red and black buttons on it, and you are left unsure what happens. These are like mini-breaker boxes, and most often trip because your hair-dryer is drawing more power than the breaker can handle, causing it to trip. The second most common is when a bulb has blown and power is actually still going to a socket. Replace the bulb, dummy.
Test equipment
Pick up a GFCI Tester at your local hardware store; everyone can use one. It is extremely easy to plug a tester into your wall to determine if that outlet is wired properly, and quick to move from one plug to another with the tester rather than carrying a light fixture around with you.
If you are a serious Do-It-Yourselfer (DIY), learn to use a Digital Multimeter, which can be used to test and diagnose a range of issues, such as how much current is going to a socket, and the breaker panels themselves to see if you have a bad breaker, current is being supplied to the house, etc.
Read a book
When the power goes out, you will not be able to reference the internet! In addition, you will need to read a book rather than a blog; you can easily do much, much more in your home to diagnose and resolve electrical problems than are listed above, but I want neither the liability nor the responsibility of imparting more detailed knowledge when so much is readily available. Get yourself a solid homeowner DIY handbook for reference; you'll use it for a long time and probably save yourself a lot of money. The Home Depot and Black & Decker standard home repair books go a long way towards helping you take care of your home.
10 Things Everyone Should Be Able to Do
If you do not already know how to do the following, pick up a reference book so that you will be able to if and when the need presents itself:
1 - Check the breaker box to see in a fuse or breaker has tripped
2 - Check outlets to determine extent of power loss
3 - Replace an outlet
4 - Replace a light switch
5 - Install a dimmer switch
6 - Read voltage on a multimeter
7 - Check an outlet with a GFCI tester
8 - Reset a GFCI outlet
9 - Install an overhead light
10 - Replace any mounted lights inside or out
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