I hope you have come across or have known about DC Generator in our previous article. If you have not seen or read it yet, read it here:
DC Generator: Working Principle, Constructions, EMF Equation, and Types
Link:- https://electricalguide360.com/dc-generator-working-principle/

This article will elaborately explain to you the types of DC generators, which is also classified in the above article.

The magnetic field in a d.c. generator is normally produced by electromagnets
rather than permanent magnets. Generators are generally classified according to
their methods of field excitation. On this basis, d.c. generators are divided into
the following two classes:

(i) Separately excited d.c. generators
(ii) Self-excited d.c. generator

The behavior of a d.c. generator on load depends upon the method of field
excitation adopted.

1. Separately Excited D.C. Generators
A d.c. generator whose field magnet winding is supplied from an independent external d.c. source (e.g., a battery, etc.) is called a separately excited generator. The figure above shows the connections of a separately excited generator. The voltage output depends upon the speed of rotation of the armature and the field current (Eg = Pf ZN/60 A). The greater the speed and field current, the greater the generated e.m.f. It may be noted that separately excited d.c. generators are rarely used in practice. The d.c. generators are normally of the self-excited type.

2. Self-Excited D.C. Generators
A d.c. generator whose field magnet winding is supplied current from the output
of the generator itself is called a self-excited generator. There are three types of
self-excited generators depending upon the manner in which the field winding is
connected to the armature, namely;

Full Article on https://electricalguide360.com/types-of-d-c-generators/

Battery-powered cars and trucks are selling briskly. Will they soon rule the road? Here's everything you need to know:

What's changed?

Electric vehicles have become the hottest cars on the market. Demand for vehicles that run solely on batteries is so great that some buyers are forced to pay deposits months before their car is available. In a recent Pew survey, 39 percent of Americans said they're likely to make their next car electric. With auto tailpipes the single greatest source of U.S. Emissions, the federal government is heavily incentivizing the switch to electric, offering $7,500 in federal tax rebates. Tesla, the reigning king of electric vehicles (EVs), sold nearly a million cars globally last year, up 87 percent, while sales for Ford's and GM's internal-combustion vehicles slumped. Europe, with EVs making up 14 percent of all vehicles sold in 2021, and China, with 9 percent, are further along than the U.S., which had 3 percent. But U.S. Automakers are moving rapidly to electrify their fleets, as globally the industry invests $500 billion in new plants and technology. "It's one of the biggest industrial transformations probably in the history of capitalism," Scott Keogh, chief executive of Volkswagen Group of America, told The New York Times. "The investments are massive, and the mission is massive."

Also read: https://electricalguide360.com/electrical-drives-parts-function-types-application/

Why are buyers so hot on EVs?

Eliminating tailpipe emissions remains the top reason for going electric, but EVs have rapidly evolved. With their futuristic design and high-torque motors, electric cars are now widely seen as powerful, high-tech, and cool — even a status symbol. Ford's fully electric Lightning version of its F-150 pickup truck is the quickest F-150 ever built, going 0 to 60 mph in 4.4 seconds, and it can tow up to 10,000 pounds. Ford had to cap pre-orders at 200,000. "We're going to be able to sell every one we can build," a Ford official said. Tesla's Cybertruck, which starts at $39,900 and looks like it's from a science fiction movie set decades from now, generated 250,000 orders within days of debuting. Not only does the average EV save owners $500 annually on fuel costs, the price of the vehicles dropped 10.8 percent last year. Some buyers like the fact that EVs — which have no engine under the hood — offer a second trunk. Others like the ability to use the battery as a portable generator and power source. Ohio business owner Eddie Berry plans to use his Lightning to power an electric smoker and TV at Ohio State football tailgates. "I'm going to be the guy everybody's talking about," he said.

What's the battery range?

It varies widely, with a full charge powering 110 miles of driving in a Mini Cooper Electric, to 373 miles for some Teslas. GM says its next generation of lithium-ion batteries will have a range of up to 450 miles. But there are many variables, including speed and even weather, since it takes a lot of juice to heat an EV without the thermal output of a traditional engine. As a result, the biggest obstacle to EV adoption is "range anxiety" — the fear of running out of power, especially on long drives. There are now roughly 50,000 charging stations in the U.S. Last year's infrastructure bill allocated $5 billion to build 500,000 charging stations, but it will take years to reach that goal. Expensive chargers can fully replenish an EV's battery in as little as 15 minutes, while the more common kind take up to 20 hours.

How green are these cars?

Only as green as the grid that charges them. In Poland, driving an EV actually generates more carbon emissions, because the grid is so coal-reliant, whereas in France, which runs its grid largely on nuclear energy, driving an EV results in 96 percent carbon savings. In the U.S., the average EV emits 200 grams of carbon dioxide per mile, compared with 385 grams for the fuel-efficient Toyota Camry or 636 grams for a gas F-150. Benefits are already visible, with Southern California — which has embraced EVs — seeing a 4 percent drop in nitrogen oxide emissions from passenger cars. Mining the lithium, cobalt, and nickel needed for modern batteries also takes considerable energy and water, although scientists say the environmental impact of oil drilling and pipelines is far worse.

What does the future hold?

It will take years and a major cultural shift to replace the 280 million cars and trucks on U.S. Roads, but automakers plan to make their fleets fully electric by 2035. There are plans for more than a dozen EV and battery factories in the U.S., including four new GM plants in Michigan, and others in Georgia, Kentucky, North Carolina, and Tennessee. FedEx, Walmart, and Hertz have made huge EV orders. Change hasn't come this fast since the Model T rolled off assembly lines. It's "like moving from the horse to the car," said Andy Palmer, a former Nissan executive who helped launch the first mass-produced electric car. "It's that seismic."

The battery-minerals problem

Industry analysts say it's a matter of time before "battery security" becomes a geopolitical priority the way "energy security" is today. Countries and corporations are racing to seize control of mines in mineral-rich countries such as Bolivia, the Democratic Republic of the Congo, Australia, and parts of the South Pacific. That raises myriad humanitarian concerns, including the use of child labor in the politically unstable Congo, and the toxins and air pollution that arise from mining certain metals. Prices for lithium, cobalt, and nickel are skyrocketing, and China — with its government pouring $100 billion into the new industry — controls 80 percent of the lithium battery supply chain, including the factories that refine raw metals that go into battery cells. Even with Tesla and Panasonic's colossal battery-making "gigafactory" in Nevada, and other automakers' planned factories in the South and Midwest, the U.S. May be forced to outsource battery making to Chinese companies. "China's problem with internal combustion engines was they were forever playing the game of catch-up," said Bill Russo, a former chief of Chrysler in China. "Now the United States has to play catch-up with electric vehicles."