AC, DC and Transformers

The video explains how electricity is supplied to homes, highlighting the transition from direct current (DC) to alternating current (AC) due to DC's inefficiency in long-distance transmission. AC allows for voltage stepping up, reducing current and power loss. Transformers play a crucial role in adjusting voltage levels for safe home use, enabling efficient electricity distribution through national grids.

What was a major drawback of using direct current (DC) for electricity transmission in the late 19th century?

• It required complex infrastructure.

• It caused significant power loss over long distances.

• It was too expensive to produce.

• It was not compatible with household appliances.

How does alternating current (AC) help in reducing power loss during long-distance electricity transmission?

• By maintaining a constant current and voltage.

• By increasing the current and reducing the voltage.

• By using thicker power lines.

• By increasing the voltage and reducing the current.

What is the primary function of a transformer in the context of electricity supply?

• To change the voltage of electricity.

• To generate electricity.

• To convert AC to DC.

• To store electrical energy.

Why is it necessary to step down the voltage of electricity before it is used in homes?

• To make it compatible with solar panels.

• To reduce electricity bills.

• To increase the current for household appliances.

• To ensure safety and usability in homes.

What happens to the current when the voltage is stepped up in a transformer?

• The current increases.

• The current fluctuates.

• The current remains the same.

• The current decreases.