The difference between dc and ac generators

Ключевые слова:
DC - direct current – постоянный ток;
AC - alternating current – переменный ток;
Electromagnetic induction – Электромагнитная индукция;
Fixed – фиксированный, неподвижный;
Coil – катушка;
Generator – генератор;
Magnetic poles – магнитные полюса.

Fill the gaps with the correct word:
Not fixed
AC
Electromagnetic induction
Fixed
DC
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1. The frequency in an generator (перем. тока) is determined by the number of magnetic poles and the rotational speed.
2. AC and DC generators both use to generate electricity.
3. In an AC generator, the coil through which current flows is .
4. In contrast, the coil in a DC generator is .
5. generator is used to power larger electric motors, even as big as those used in subway systems.

DC generator
DC Generator Advantages
Simple design
Runs large motors
Smooth voltage
Picture 1 - DC generator

Unlike an AC generator, a DC generator often does not require an inverter, which reduces the cost and difficulty of running the current. However, this is only the case with regard to powering a small system, such as a small RV or camper.
Cost
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Picture 2 - DC generator

A DC generator is energy and cost efficient as long as you use it correctly. It is also a very efficient way to power electrical appliances that are made to run on a DC current.
Efficiency
Picture 3 - DC generator

However, if the wiring becomes difficult or complex, you may be required to run a longer wire to transfer electricity from the generator to the specified location to provide power. If this is the case, the longer wire becomes a disadvantage. If you must run the wire longer than 100 feet, an AC generator may be a better choice.
The main disadvantage