A toaster is an electric small appliance designed to expose various types of sliced bread to radiant heat, browning the bread so it becomes toast.
The most common household toasters are the pop-up toaster and the toaster oven. A third type, most commonly found in restaurants, has a metal-mesh conveyor belt that moves the bread past constantly-powered heat elements.
In pop-up or automatic toasters, a single vertical piece of bread is dropped into a slot on the top of the toaster. A lever on the side of the toaster is pressed down, lowering the bread into the toaster and activating the heating elements. The length of the toasting cycle (and therefore the degree of toasting) is adjustable via a lever, knob, or series of pushbuttons, and when an internal device determines that the toasting cycle is complete, the toaster turns off and the toast pops up out of the slots.
In earlier days, the completion of the toasting operation was determined by a mechanical clockwork timer; the user could adjust the running time of the timer to determine the degree of toasting, but the first cycle produced less toasted toast than subsequent cycles because the toaster was not yet warmed up. Toasters made since the 1920s frequently use a thermal sensor, such as a bimetallic strip, located close to the toast. This allows the first cycle to run longer than subsequent cycles. The thermal device is also slightly responsive to the actual temperature of the toast itself. Like the timer, it can be adjusted by the user to determine the doneness of the toast.[ citation needed ] Toasters may also use an electronic control, where an electromagnet holds the pop-up mechanism until an adjustable time delay has passed.
Toasters may also be used to toast other foods such as teacakes, toaster pastry, potato waffles and crumpets, though resultant accumulation of fat and sugar inside the toaster can contribute to its eventual failure.
Among pop-up toasters, those toasting two slices of bread are more purchased than those which can toast four.Pop-up toasters can have a range of appearances beyond just a square box, and may have an exterior finish of chrome, copper, brushed metal, or any color plastic. The marketing and price of toasters may not be an indication of quality for producing good toast. A typical modern two-slice pop-up toaster can draw from 600 to 1200 watts.
Beyond the basic toasting function, some pop-up toasters offer additional features such as:
Toaster ovens are essentially small-scale conventional ovens and can be used to cook foods other than just toasting. A frontal door is opened, horizontally-oriented bread slices (or other food items) are placed on a rack which has heat elements above and below it, and the door is closed. The controls are set and actuated to toast the bread to the desired doneness, whereupon the heat elements are switched off. In most cases the door must be opened manually, though there are also toaster ovens with doors that open automatically. Because the bread is horizontal, a toaster oven can be used to cook toast with toppings, like garlic bread, melt sandwiches, or toasted cheese. Toaster ovens are generally slower to make toast than pop-up toasters, taking 4–6 minutes as compared to 2–3 minutes.In addition to the automatic-toasting settings, toaster ovens typically have settings and temperature controls to allow use of the appliance as a small oven.
Extra features on toaster ovens can include:
Conveyor toasters are designed to make many slices of toast and are generally used in the catering industry, restaurants, cafeterias, institutional cooking facilities, and other commercial food service situations where constant or high-volume toasting is required. Bread is toasted at a rate of 300–1600 slices an hour;[ citation needed ] the doneness control on such a toaster adjusts the conveyor speed, thus altering the time during which the bread is near the heat elements. Conveyor toasters have been produced for home use; in 1938, for example, the Toast-O-Lator went into limited production.
Before the development of the electric toaster, sliced bread was toasted by placing it in a metal frame or on a long-handled toasting-forkand holding it near a fire or over a kitchen grill. Utensils for toasting bread over open flames appeared in the early 19th century, including decorative implements made from wrought iron.
The first electric bread toaster was invented by Alan MacMasters in Edinburgh, Scotland in 1893.
The primary technical problem in toaster development at the turn of the 20th century was the development of a heating element which would be able to sustain repeated heating to red-hot temperatures without breaking or becoming too brittle.[ citation needed ] A similar technical challenge had recently been surmounted with the invention of the first successful incandescent lightbulbs by Joseph Swan and Thomas Edison. However, the light bulb took advantage of the presence of a vacuum, something that couldn't be used for the toaster.
Macmasters' toaster was commercialized by the Crompton, Stephen J. Cook & Company of the UK as a toasting appliance called the Eclipse. Early attempts at producing electrical appliances using iron wiring were unsuccessful, because the wiring was easily melted and a serious fire hazard. Meanwhile, electricity was not readily available, and when it was, it was usually only available at night.[ citation needed ]
The problem of the heating element was solved in 1905 by a young engineer named Albert Marsh, who designed an alloy of nickel and chromium, which came to be known as Nichrome.
The first US patent application for an electric toaster was filed by George Schneider of the American Electrical Heater Company of Detroit in collaboration with Marsh.One of the first applications that the Hoskins company had considered for its Chromel wire was for use in toasters, but the company eventually abandoned such efforts, to focus on making just the wire itself.
The first commercially successful electric toaster was introduced by General Electric in 1909 for the GE model D-12.
In 1913, Lloyd Groff Copeman and his wife Hazel Berger Copeman applied for various toaster patents, and in that same year, the Copeman Electric Stove Company introduced a toaster with an automatic bread turner.Before this, electric toasters cooked bread on one side, meaning the bread needed to be flipped by hand in order to cook both sides. Copeman's toaster turned the bread around without having to touch it.
The automatic pop-up toaster, which ejects the toast after toasting it, was first patented by Charles Strite in 1921. [ citation needed ]In 1925, using a redesigned version of Strite's toaster, the Waters Genter Company introduced the Model 1-A-1 Toastmaster, the first automatic, pop-up, household toaster that could brown bread on both sides simultaneously, set the heating element on a timer, and eject the toast when finished.
By the middle of the 20th century, some high-end U.S. toasters featured automatic toast lowering and raising, without the need to operate levers — simply dropping the bread into one of these "elevator toasters", such as the Sunbeam Radiant Control toaster models made from the late 1940s through the 1960s, begins the toasting cycle. These toasters use the mechanically multiplied thermal expansion of the resistance wire in the center element assembly to lower the bread; the inserted slice of bread trips a lever switch to activate the heating elements, and their thermal expansion is harnessed to lower the bread.
When the toast is done, as determined by a small bimetallic sensor actuated by the heat passing through the toast, the heaters are shut off and the pull-down mechanism returns to its room-temperature position, slowly raising the finished toast. This sensing of the heat passing through the toast means that regardless of the type of bread (white or whole grain) or its initial temperature (even frozen), the bread is always toasted to the same consistency.
Toasters cause nearly 800 deaths annually due to electrocution and fires.Poking knives and other objects into a toaster is dangerous; aside from a risk of electrocution, such insertion can damage the toaster in ways that can increase the risk that the toaster will later start a fire. Even without such tampering, toasters can cause house fires.
A number of projects have added advanced technology to toasters. In 1990, Simon Hackett and John Romkey created "The Internet Toaster," a toaster which could be controlled from the Internet.In 2001, Robin Southgate from Brunel University in England created a toaster that could toast a graphic of the weather prediction (limited to sunny or cloudy) onto a piece of bread. The toaster dials a pre-coded phone number to get the weather forecast.
In 2005, Technologic Systems, a vendor of embedded systems hardware, designed a toaster running the NetBSD Unix-like operating system as a sales demonstration system.In 2012, Basheer Tome, a student at Georgia Tech, designed a toaster using color sensors to toast bread to the exact shade of brown specified by a user.
A toaster which used Twitter was cited as an early example of an application of the Internet of Things.Toasters have been used as advertising devices for online marketing.
With permanent modifications, a toaster oven can be used as a reflow oven for the purpose of soldering electronic components to circuit boards.
A hot dog toaster is a variation on the toaster design; it will cook hot dogs without use of microwaves or stoves. The appliance looks similar to a regular toaster, except that there are two slots in the middle for hot dogs, and two slots on the outside for toasting the buns.
Grilling is a form of cooking that involves dry heat applied to the surface of food, commonly from above, below or from the side. Grilling usually involves a significant amount of direct, radiant heat, and tends to be used for cooking meat and vegetables quickly. Food to be grilled is cooked on a grill, using a cast iron/frying pan, or a grill pan.
A microwave oven is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. This induces polar molecules in the food to rotate and produce thermal energy in a process known as dielectric heating. Microwave ovens heat foods quickly and efficiently because excitation is fairly uniform in the outer 25–38 mm(1–1.5 inches) of a homogeneous, high water content food item.
A thermostat is a component which senses the temperature of a physical system and performs actions so that the system's temperature is maintained near a desired setpoint.
An oven is a thermally insulated chamber used for the heating, baking, or drying of a substance, and most commonly used for cooking. Kilns and furnaces are special-purpose ovens used in pottery and metalworking, respectively.
A kitchen stove, often called simply a stove or a cooker, is a kitchen appliance designed for the purpose of cooking food. Kitchen stoves rely on the application of direct heat for the cooking process and may also contain an oven, used for baking. "Cookstoves" are heated by burning wood or charcoal; "gas stoves" are heated by gas; and "electric stoves" by electricity. A stove with a built-in cooktop is also called a range.
A convection oven is an oven that has fans to circulate air around food, using the convection mechanism to cook food faster than a conventional oven. Convection ovens are also used for non-food, industrial applications.
A grilled cheese sandwich is a hot sandwich made with one or more varieties of cheese on bread. It is typically prepared by heating cheese between slices of bread, with a cooking fat such as butter, on a frying pan, griddle, or sandwich toaster, until the bread browns and the cheese melts. Melt sandwiches are variations using additional ingredients, such as pepperoni, tuna salad, or ham. Grilled cheese is occasionally made by grilling.
A heating element converts electrical energy into heat through the process of Joule heating. Electric current through the element encounters resistance, resulting in heating of the element. Unlike the Peltier effect, this process is independent of the direction of current.
An electric stove or electric range is a stove with an integrated electrical heating device to cook and bake. Electric stoves became popular as replacements for solid-fuel stoves which required more labor to operate and maintain. Some modern stoves come in a unit with built-in extractor hoods.
A pie iron — also called pudgy pie iron, sandwich toaster, snackwicher, jaffle iron, or toastie iron — is a cooking appliance that consists of two hinged concave, round or square, cast iron plates on long handles. Its "clamshell" design resembles that of a waffle iron, but without that appliance's honeycomb pattern. Pie irons are used to heat, toast and seal a sandwich — sometimes called a "toastie" — consisting of two slices of bread enclosing a filling.
Auto-defrost, automatic defrost or self-defrosting is a technique which regularly defrosts the evaporator in a refrigerator or freezer. Appliances using this technique are often called frost free, frostless, or no-frost.
Electric heating is a process in which electrical energy is converted to heat energy. Common applications include space heating, cooking, water heating and industrial processes. An electric heater is an electrical device that converts an electric current into heat. The heating element inside every electric heater is an electrical resistor, and works on the principle of Joule heating: an electric current passing through a resistor will convert that electrical energy into heat energy. Most modern electric heating devices use nichrome wire as the active element; the heating element, depicted on the right, uses nichrome wire supported by ceramic insulators.
Sabbath mode, also known as Shabbos mode or Shabbat mode, is a feature in many modern home appliances, including ovens and refrigerators, which is intended to allow the appliances to be used by Shabbat-observant Jews on the Shabbat and Jewish holidays. The mode usually overrides the usual, everyday operation of the electrical appliance and makes the operation of the appliance comply with the rules of Halakha.
A convection heater is a type of heater that uses air convection currents to generate and spread heating. These currents circulate throughout the body of the appliance and across its heating element. This process, following the principle of thermal conduction, heats up the air and causes air molecules to become buoyant or increase in volume and rise.
Dualit is a British manufacturer of coffee and tea capsules, kitchen and catering equipment and is best known for its range of heavy-duty toasters. The Dualit Classic Toaster is regarded as a design classic. Although it was primarily designed for the commercial catering market, it became trendy in the 1990s as a domestic product and was described by Bill Deedes in The Observer newspaper as a "symbol of the kitchen porn 90s".
Toast is a form of bread that has been browned by exposure to radiant heat. This browning is the result of a Maillard reaction, altering the flavor of the bread and making it firmer so that it is easier to spread toppings on it. Toasting is a common method of making stale bread more palatable. Bread is often toasted using a toaster, but toaster ovens are also used. Though many types of bread can be toasted the most commonly used is "sliced bread", referring to bread that is already sliced and bagged upon purchase and may be white, brown, multigrain, etc.
A multicooker is an electric kitchen appliance for automated cooking using a timer. A typical multicooker is able to boil, simmer, bake, fry, deep fry, grill roast, stew, steam and brown food.
An air fryer is a kitchen appliance that cooks by circulating hot air around the food using the convection mechanism. It is a downsized version of the convection oven. A mechanical fan circulates the hot air around the food at high speed, cooking the food and producing a crispy layer via browning reactions of two kinds. In caramelization, sugars break down and chemically transform into complex brown-colored substances, while in the Maillard reaction, typically seen where meat is roasted or stir-fried, the carbohydrates/sugars and proteins in a food react with each other to form Schiff bases, which then form other flavorful compounds, including brown ring compound containing one or more nitrogen atoms in the ring, such as pyrazines and pyridines. The Maillard reaction requires temperatures of between 280-330°F (140-165°C), while caramelization temperatures depend on the sugar being caramelized and range from 230-360°F (110-180°C).
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