Is your smoke detector hard-wired into your electrical system? Doing so has many benefits, including the fact that you never have to worry about the battery going dead—though battery backup is a wise choice as well. However, just like any other appliance or home security system, your hard-wired smoke detectors do experience wear and tear over the years, and eventually will need to be replaced. How do you know when it’s time though?

Hard-wired smoke detector systems are designed to last about a decade. The reason they wear out isn’t necessarily from use, but rather because over time, dust gathers inside the smoke detectors and eventually desensitizes them. It’s a wise choice to replace all the smoke detectors connected to your system at once, to ensure that they are all fully functional. The safety of your home and your family may depend on it. Be sure to hire a professional electrician to do this job, so that you ensure it is done correctly.

The National Fire Protection Association (NFPA) shares the following safety tips to ensure your family is protected as well as they can be from the risks of a fire:

If you are interested in learning everything about electricity, you should start by understanding the basic components that make up any electrical design and how they work. Think about how the great pyramids of Egypt were built using just blocks of rock. The rocks themselves were nothing, but when combined with careful design they formed such grand structures!

Similarly, you need to know about the basic electrical components and how they work together to create wonderful modern electrical systems. Below you will find information about the most common electrical components:

The very first component that you should know about is the resistor. It is fairly easy to assume that a resistor, as the name suggests, will resist electricity that flows through it, and you would be correct in that assumption too! Any situation that demands the flow of current to be controlled at a desired level will require a resistor.

Here are two scenarios that better explain what a resistor does. In both cases, we will be turning on a LED:

Scenario 1 – Without Resistor

Scenario 2 – With Resistor

If a resistor is like a cushion that is used to control the flow of electricity, then capacitors are like small rechargeable batteries that store small amounts of charge in them. Capacitors do two things at the same time:

By so doing, they are able to stabilize almost any circuit. There are two types of capacitors that are primarily used:

I briefly alluded to LEDs in the scenarios that were used under “Resistors” above. LEDs are just like bulbs except that they are extremely reliable. You can find them on practically every appliance in your home that features some kind of an indicator light. A typical LED bulb can last decades with no sign of dying.

Since they are so reliable, they are used to indicate the state of current at any point in a circuit. An important task like checking the output voltage or current on a circuit becomes simpler with these light-based indicators.

The resistors, capacitors, and LEDs are the simple stuff in electrical circuits. Now, let us talk about the first complicated component – the transistor. Transistors are used to build complex electrical systems, such as amplifiers for instance. A simple way to understand transistors is to think of a switch. A basic switch has an “on” and an “off” state. These are controlled by the position of the switch, which is changed manually.

A transistor is a more advanced switch that has multiple output states. Unlike a switch, you cannot change these states manually. The only way to switch the transistor between various states is to run current through it. By controlling the current that flows through the transistor, you can control the output state to achieve the results you desire.

Do me a favor and imagine that you are in need of suggestions for a Fourth of July party. You head to via Wikipedia

Of course, I’m not talking about snap pops, black cats, m-80s, or even those cool little paper cars that gush sparks, travel four feet, and then burn to death in a microblaze reminiscent of a 1970s action film.

I am talking about the ones that explode up there, the ones you have to tilt your head back to see. That the fireworks explode in the night sky is important because the very act of looking up immediately takes you out of the mundanity that the rest of the holiday will surely deliver – the planning, the decorating, the complications. No more overflowing trashcan with wing sauce-smeared cocktail napkins. No more ordinary stuff.

At the heart of the Fourth of July is a spirit of independence that is, actually, a big deal. When your eyes are on what’s going on at ground level, it can be hard to realize how big a deal ideas like independence and sacrifice are. Once your attention is arrested by the spectacle of fireworks happening up there in the sky, you’re taken out of the everyday and able to reflect on these things, which is important, I think.

2. They are glorious.

“And the rockets’ red glare/ The bombs bursting in air,” goes the song. Did you know that the word “rocket,” in the sense of the combustion-fueled projectile, dates all the way back to 1566? The Oxford English Dictionary notes that rockets have historically been “used for signalling, in maritime rescue, for entertainment, and as a weapon.” Fireworks symbolize communication, violence, and entertainment: A strangely fitting mix for the complex human heart.

The red glare of the rockets in “The Star-Spangled Banner” refers to the bombardment of Fort McHenry in the War of 1812. That the fort was not taken during the battle is indeed glorious, and fireworks are a reminder of the fortitude of the people who fought and suffered to keep America independent in 1776 and again in 1812. Boom. (Literally: boom!)

3. They are beautiful.

So, those are my three reasons that fireworks are the most important part of any holiday festivity: They happen above you; they are glorious; and they are beautiful. I think these are pretty good reasons for making sure you see some fireworks this Fourth of July.

Take a moment out of the hectic festivities to reflect on the spirit of rebellion, creativity, and inspiration that is involved in claiming and defending independence from parties eager to exploit the vulnerable. This is about more than just us. This unites us across time and space. Fireworks reflect the beauty of standing together for what is right, even when it hurts.

Early in the month, American Airlines Flight 1420 crashed near Little Rock, AK. This crash, along with a few others that took place soon before and after, inspired research into the deleterious effects of sleep deprivation on pilot safety.

3) A Whole, Whole Lot of Drug Money

In June 1999, George Bush announced his candidacy for the office of President of the United States of America. So much was about to change in our culture during the next 8 years.

5) Lord Stanley’s Cup

via www.moviesonline.ca6

In June 1999, Stephen King got hit by a car and was flung 14 feet while walking on the shoulder of a road in Maine. What’s the name of that Stephen King book about the car? Oh yeah, Christine. Any connection? You never know. But I’m sure King was thankful Kathy Bates didn’t find him after the accident.

7) The Weird Looking Predecessor of the MacBook Is Born

That mildly annoying yet overall charming goofball Austin Powers (Mike Myers’s colorful character) graced the cover of Rolling Stone in June 1999, exuberantly celebrating the sequel to the original Austin Powers blockbuster smash hit. Smashing, baby!

9) Adam Sandler Tones It Down a Little

The universe’s hippest couple, who, of course played in a rock band together, hit the popular scene with their debut album in June 1999. Then, they became insanely famous. And then, thirteen thousand two-piece rock bands, featuring only guitar and drums, were born. I think now, 15 years later, we are finally beginning to see the decline in that questionable trend. Bass matters, people.

11) That Kid from Walking Dead Was Born

Venus and Serena Williams, two twin females from a socioeconomically disadvantaged place, won the Grand Slam female doubles event for the first time. They were the second sister team to win a Grand Slam event since 1890. This is the kind of thing that just makes you smile. These are some of the best ever to play the sport.

13) MORE TENNIS!