Why Transformers Are Used

The video tutorial explains the use of transformers in adjusting voltage levels for efficient power transmission. It covers how step up transformers increase voltage to reduce energy loss over long distances, while step down transformers decrease voltage for safe home use. The tutorial also discusses the differences in voltage systems between North America and the rest of the world, highlighting the A3 and A2 wire systems.

Why is a step-up transformer used in power transmission from power stations?

• To increase the voltage for efficient long-distance transmission

• To decrease the voltage for local distribution

• To convert AC to DC

• To stabilize the voltage fluctuations

What happens to the current when the voltage is increased through a transformer?

• The current remains the same

• The current decreases

• The current increases

• The current fluctuates

How much energy loss occurs when transmitting power at 400,000 volts compared to 240 volts?

• 87% loss at 400,000 volts

• 1% loss at 400,000 volts

• 50% loss at 400,000 volts

• No loss at 400,000 volts

What is the main advantage of the 2-wire system used in most of the world?

• It is a simpler design allowing more power to outlets

• It allows for higher voltage levels

• It supports both AC and DC currents

• It reduces the need for transformers

Why can homes in North America have either 120 or 240 volts?

• Because of the use of a 2-wire system

• Due to the use of a step-up transformer

• Due to the use of a voltage stabilizer

• Because of the use of a 3-wire system