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Fire Alarm -- Residential

Douglas Krantz -- Fire Alarm Engineering Technician, Electronic Designer, Electronic Technician, Writer








What Happens When Water is Thrown on a Cooking Grease Fire? -- Cooking is good; grease catching on fire while cooking is bad. With all that sizzling crackle and pop, frying bacon sounds mouthwatering. But... Read More

Aren't Those Coat Hanger Racks on the Wall? -- Hotels, motels, apartment buildings, condominiums, townhouses, and some newer private homes, all have automatic fire-fighting sprinkler systems. Without anyone needing to do anything... Read More

What Should I Do When the Fire Alarm Sounds? -- When the alarm sounds, as caretaker for an apartment building, what should you be doing? "I would never suggest turning off the fire alarms, or in any way... Read More

How Do You Let the Smoke Out of the Apartment? -- OK. Now the bacon is overcooked and, making the smoke alarm sound off, the apartment is full of smoke. That kind of thing happens... Read More

Don't Smoke Alarms Detect Smoke? -- A smoke alarm isn't really a smoke alarm at all; a smoke alarm is a particles-in-the-air alarm. When a smoke alarm detects particles... Read More

Why Doesn't My Smoke Alarm Set Off The Building Alarms? -- In apartment Buildings, real fire alarms are bad; false fire alarms are just as bad... or worse... Read More

What's the Difference between a Smoke Alarm and a Smoke Detector? -- Smoke alarms are inside houses, townhouses, apartments or condominiums. In areas that people live and sleep, smoke alarms are there to alert the ... Read More

The Alarm Chirps, Which One is it? -- In the home or apartment, there's a loud chirping, almost like a bird, but it's electronic. Coming from somewhere, every...Read More







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Douglas Krantz

Describing How It Works
writer@douglaskrantz.com
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Articles

How Does Class A Fire Alarm Wiring Work?-- Fire alarm systems save lives and protect property. Fire alarm systems also break down because... Read More

Just What Is a Signaling Line Circuit (SLC)? -- The SLC (Signaling Line Circuit) is another way of saying Data and Power Circuit. Along with added power to run the sub-computers and their input and output circuits, it's a computer data-buss ... Read More

How is a Buffer Relay Wired Into a Door Holder Circuit? -- Like a door stop, a door holder keeps a fire door open. When smoke is detected, the door holder releases, allowing the door to shut. The door holder looks simple and innocuous enough... Read More

How Does One Find a Soft Ground Fault? -- Normally, we think of resistance like that of a resistor. The amount of resistance is built-in; no matter what voltage is used to drive the electrical... Read More

Can a Magnet Really be Used to Test a Smoke Detector? -- Smoke detectors usually have two ways of being tested. Smoke (smoke particles in the air, or some sort of canned smoke), and magnets (the activation of an internal magnetic... Read More



Electrical Flow


On this website, most references to electrical flow are to the movement of electrons.

Here, electron movement is generally used because it is the electrons that are actually moving. To explain the effects of magnetic forces, the movement of electrons is best.

Conventional current flow, positive charges that appear to be moving in the circuit, will be specified when it is used. The positive electrical forces are not actually moving -- as the electrons are coming and going on an atom, the electrical forces are just loosing or gaining strength. The forces appear to be moving from one atom to the next, but the percieved movement is actually just a result of electron movement. This perceived movement is traveling at a consistent speed, usually around two-thirds the speed of light. To explain the effects of electrostatic forces, the movement of positive charges (conventional current) is best.

See the explanation on which way electricity flows at www.douglaskrantz.com/
ElecElectricalFlow.html
.