Molly Ayala
The adoption of electricity in homes was a gradual process that occurred over several decades. In the early days, electricity in homes was considered a luxury, with most homes using gas lighting. However, by the 1920s, electric power had become commonplace in the United States, with close to 70% of homes having access to electricity by 1929. This trend continued, and by 1940, 85% of US residences had access to electricity. So, what about 1950 – how many homes were powered by electricity by then?
| Characteristics | Values |
|---|---|
| Year | 1950 |
| Country | United States |
| Number of Homes with Electricity | Not specified, but by 1940, 85% of US residences had access to electricity |
| Type of Electricity | High-voltage transmission lines |
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What You'll Learn
The first electrified home
The history of electricity in homes is a fascinating one. In the early days, steam boilers and gas lanterns were the norm in cities like New York until the late 1800s. As the story goes, Thomas Edison was working on developing the light bulb in his laboratory in New Jersey during this time. He proposed a revolutionary idea to use electric lamps instead of gas lighting, which would save the city money. This proposal marked the beginning of the electrification of homes.
Indeed, the first home to be electrified was that of J.P. Morgan, who hired Thomas Edison to build a generator to power the 400 light bulbs in his residence. This partnership between Morgan and Edison would go on to significantly shape the future of electrical distribution. Edison's direct current (DC) power, similar to a battery, was the basis for his electrical grid. However, it had limitations, particularly when it came to powering entire cities and street lights.
Serbian-American scientist Nikola Tesla played a pivotal role in addressing these limitations. He developed alternating current (AC) power, which proved to be more efficient for both urban and domestic settings. Tesla's AC technology could power homes and street lights from a central station, overcoming the challenges posed by Edison's DC system. The ""War of the Currents"" at the turn of the twentieth century saw Tesla and Edison in competition, but ultimately, AC power emerged as the winner.
By 1896, alternating current was being used to power the city of Buffalo, and by 1898, it illuminated 45,000 lights in New York City. This marked a significant milestone in the electrification of homes, as electricity transitioned from a luxury to a necessity. By 1929, the US generated more electric power than the rest of the world combined, and electric power had become an integral part of American life. Close to 70% of homes had access to electricity by then, and this number only continued to grow.
The electrification of homes brought about a wave of new inventions and appliances designed to make life easier and more convenient. The electric iron, for instance, paved the way for other innovations, including vacuum cleaners, electric ovens, refrigerators, and dishwashers. As electricity became more accessible, entrepreneurs and inventors were spurred to create an array of devices that we now take for granted in our daily lives.
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DC vs AC debate
By 1950, electricity was available in nearly 70% of US homes, and the US was tied together by an enormous network of high-voltage transmission lines. However, this percentage is not available for the rest of the world. In 2023, 89.6% of the world's population had access to electricity, indicating that the number would have been lower in 1950.
The availability of electricity is a defining feature of the modern era. At the heart of this electrified world lies a fundamental debate: alternating current (AC) versus direct current (DC) power systems. Understanding the differences between these two forms of electrical energy is crucial for engineers, policymakers, and consumers.
The rivalry between AC and DC can be traced back to the late 19th century, epitomized by the battle between Nikola Tesla's alternating current system and Thomas Edison's direct current system, known as the War of Currents. Edison championed DC power, advocating for its safety and reliability, while Tesla and his supporters argued for the superiority of AC due to its ability to be easily transformed to higher voltages for efficient long-distance transmission.
AC and DC power systems have distinct characteristics. AC power flows in one direction and then reverses, oscillating back and forth in a sinusoidal waveform, while DC maintains a constant flow of electrons in a single direction. AC systems typically operate at higher voltages and frequencies, while DC systems maintain a steady voltage level. AC power is versatile, efficient, and compatible with a wide range of devices and appliances, making it the standard for electrical power supplied to homes and businesses. DC power, on the other hand, is commonly found in batteries, electronic devices, and solar panels, where a stable, unidirectional current is required.
The debate between AC and DC continues to evolve with emerging technologies and changing societal needs. AC power is dominant in most power systems worldwide due to its efficiency in long-distance transmission and power distribution. However, DC power is gaining traction in specific applications, such as high-voltage direct current (HVDC) transmission, solid-state power electronics, and DC microgrids. DC infrastructure is less developed and widespread, requiring significant investment in new infrastructure for large-scale deployment.
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Electric power in 1929
The 1920s was a period of significant change and prosperity, with many technological advancements, including in the electrical industry. By 1929, about 70% of manufacturing activity relied on electricity, a notable increase from around 30% in 1914. This shift to electric power contributed to mass production and increased productivity. Electrical utilities were distributing electricity, and the stocks of these companies contributed to the stock market boom of the late 1920s.
The electrical industry itself underwent exciting developments in the 1920s, with improved power transmission, better distribution, and advancements in motors, controls, and trans-Atlantic telephone service. The tungsten lamp, for instance, offered better, cheaper, and longer-lasting lighting. Electrical appliances such as refrigerators and ranges also became more common, creating new opportunities for electrical workers.
The 1920s also saw advancements in radio, television, and film, with the electrical industry playing a crucial role in these innovations. The decade witnessed the development of several notable technologies, including Bell Telephone Laboratories' mechanism for recording sound electrically and improvements in circuit breakers by Westinghouse and Siemens.
However, the prosperity of the Roaring Twenties came to an abrupt end with the stock market crash of 1929, which plunged the United States and Canada into the Great Depression. Despite the economic crisis, the electrical industry continued to make strides, and by the 1930s, hydropower dominated new additions to generation capacity, further cementing the role of electricity in the nation's economy and everyday life.
Safety concerns regarding electrical fires and the use of flexible cords in circuit work were also prevalent in 1929, as highlighted by the electrical bureau of the New York Board of Fire Underwriters. Overall, the electrical industry in 1929 was characterised by both the promise of technological advancements and the challenges of ensuring safe and effective utilisation of this rapidly evolving technology.
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Electric power in 1940
In the 1940s, electricity changed the farm economy. By the late 1930s, electricity was commonplace in American cities, but only 10% of American farms were electrified. In contrast, 85 to 100% of farm families in many European countries and Canada had access to low-cost, abundant power. This was due to the fact that, until the mid-1930s, the provision of power to rural areas in the US was not considered economically feasible. However, in the 1940s, member-owned cooperatives began purchasing power wholesale and distributing it using their own transmission and distribution lines. Two months after the REA went into effect, the first rural electric cooperative was established in Minnesota, becoming the first rural electric demonstration site in the nation.
During this time, electricity output by major powers during World War II was measured in billions of kilowatt-hours. Electric power transmission, or the means of moving electricity far from where it is generated, dates back to the late 19th century. Early electricity was direct current, which could not be easily adjusted for long-distance transmission or for sharing a common line with multiple types of electric devices. As a result, companies were forced to run different lines for different classes of loads. For example, Charles Brush's New York arc lamp systems required up to 10 kV, while Edison's incandescent lights used 110 V.
In the 19th century, cities used hydraulic transmission, delivering power to factory motors through high-pressure water mains. These systems were eventually replaced by cheaper and more versatile electrical systems. By the end of the century, city planners and financiers understood the benefits and economics of establishing power transmission systems. They were aware that increasing voltage while decreasing current allowed for the same amount of power to be transferred over a longer distance. This knowledge led to the development of high-voltage transmission systems in the early 20th century.
The Thury System, a commercial system for high-voltage DC transmission, was successfully used in several projects. The first high-voltage system was implemented in 1889 in Genoa, Italy, transmitting 630 kW at 14 kV DC over a 120 km circuit. The largest Thury System was the Lyon Moutiers project, which delivered 20 megawatts at 125 kV over a 230 km distance. These advancements in electric power transmission played a crucial role in bringing electricity to rural areas and changing the farm economy in the 1940s.
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The incandescent lamp
The lamp works by passing an electric current through the filament, which causes it to heat up and emit light. This is known as incandescence. The phenomenon of incandescence was first demonstrated by Ebenezer Kinnersley in 1761, although the wires he used tended to melt or burn rapidly in the presence of air. In the early 19th century, limelight—created by heating calcium oxide to incandescence with an oxyhydrogen torch—became a popular form of stage lighting. Humphry Davy also experimented with creating an incandescent light in 1802, using a battery to pass a current through a thin strip of platinum.
Over the first three-quarters of the 19th century, researchers continued to experiment with various combinations of platinum or iridium wires, carbon rods, and evacuated or semi-evacuated enclosures. The carbon arc lamp, for example, emitted a dim, violet light and was only suitable for lighting large areas.
Incandescent bulbs have a wide range of applications in household and commercial lighting, portable lighting (e.g. table lamps, car headlamps, flashlights), and decorative and advertising lighting. They are inexpensive to manufacture and can operate on either alternating or direct current. However, they are less efficient than other types of electric lighting, converting less than 10% of their energy into visible light, with the rest released as heat.
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Frequently asked questions
Half of all homes in the US had electricity by 1925.
By 1929, nearly 70% of homes in the US had access to electricity.
By 1930, electricity was available in nearly 70% of US homes.
By 1940, 85% of all US residences had access to electricity.
