Transformer Basics

What is the main function of a transformer?

• Play music

• Cook food

• Change voltage level of AC circuit

• Drive cars

In a transformer, which component is responsible for inducing a voltage in the secondary coil?

• Magnetic core

• Primary coil

• Voltage regulator

• Secondary coil

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

• The current decreases

• The current fluctuates

• The current increases

• The current remains the same

Why is it important to insulate the primary and secondary coils in a transformer?

• To reduce the cost of production

• To make the coils more visible

• To increase the weight of the transformer

• To prevent electrical leakage, ensure safety, and improve efficiency.

What is the difference between a step-up transformer and a step-down transformer?

• A step-up transformer decreases voltage

• A step-up transformer decreases current

• A step-down transformer increases voltage

• A step-down transformer increases current

• The difference is that a step-up transformer increases voltage, whereas a step-down transformer decreases voltage.

How does a transformer help in transmitting electricity over long distances?

• A transformer converts electricity into a different form for transmission over long distances.

• A transformer has no impact on the transmission of electricity over long distances.

• A transformer steps down the voltage at the power plant, increasing current and energy losses in transmission lines.

• A transformer steps up the voltage at the power plant, reducing current and energy losses in transmission lines.

What is the core of a transformer usually made of?

• Steel plates

• Aluminum foil

• Laminated iron sheets

• Copper wire

What is the efficiency of an ideal transformer?

• 100%

• 90%

• 75%

• 50%

What is the formula to calculate the number of turns in the secondary coil of a transformer?

• Ns = (Vs/Vp) * Np

• Ns = (Vs - Vp) * Np

• Ns = (Vp * Np) / Vs

• Ns = (Vs * Np) / Vp

Why are transformers essential in the distribution of electricity in households?

• To decrease the efficiency of electricity distribution.

• To step down the high voltage from power lines to a lower voltage suitable for household use.

• To increase the risk of electrical fires in households.

• To reduce the cost of electricity for households.