Question

1) Give 3 examples of devices that use:

a) dc
b) ac
2) Explain how ac and dc are similar and different
3) Explain how and why alternating current is generated in power stations instead of direct curren
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Answer 1

1)

a) DC devices: battery-operated devices (such as flashlights or cellphones), electric cars, and solar panels.

b) AC devices: electric kettles, refrigerators, and air conditioning.

2) AC and DC are similar in that they are both forms of electric power. However, they differ in that AC is characterized by the flow of electric charge that regularly reverses direction, whereas DC is characterized by the flow of electric charge that only flows in one direction.

3) Alternating current is generated in power stations as a means of transmitting electric power over long distances without significant energy loss. AC can be easily converted to different voltage levels using transformers, making it more efficient for long-distant power transmission. Additionally, AC generators are simpler and less expensive to construct than DC generators, as they require fewer components and mechanical parts. Thus, AC generation is a more practical and cost-effective solution for large-scale power generation.

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