CA, CC y transformadores

The video explains the evolution of electricity from direct current (DC) to alternating current (AC), highlighting the limitations of DC in long-distance power transmission due to heating losses. AC's ability to change direction allows for voltage adjustments, enabling efficient long-distance transmission. Transformers play a crucial role in modifying voltage levels, allowing high-voltage transmission and safe domestic use. Step-down transformers reduce voltage for home use, ensuring safety and efficiency.

What was a major drawback of using direct current (DC) for electricity transport?

• It caused significant heating losses in power lines.

• It was difficult to generate consistently.

• It was not powerful enough for industrial use.

• It was too expensive to produce.

How does alternating current (AC) differ from direct current (DC)?

• AC changes direction, while DC flows in one direction.

• AC flows in one direction, while DC changes direction.

• AC is used for short distances, while DC is for long distances.

• AC is more expensive to produce than DC.

What is the primary function of a transformer in an electrical grid?

• To modify the voltage of power lines.

• To convert electricity into mechanical energy.

• To store electricity for later use.

• To generate electricity from renewable sources.

Why is it necessary to use step-down transformers for domestic electricity?

• To convert AC to DC for home use.

• To store electricity for emergency use.

• To increase the voltage for home appliances.

• To decrease the voltage to safe levels for home use.

What happens to the intensity of current when the voltage is increased in a transformer?

• The intensity increases.

• The intensity fluctuates randomly.

• The intensity decreases.

• The intensity remains the same.