Transformers

The video explains transformers, devices that change the voltage of an alternating current. It covers how transformers work, including their components like primary and secondary coils, and the role of alternating current. The video distinguishes between step up and step down transformers, explaining how they alter voltage levels. It provides a calculation example to determine the voltage in a secondary coil. The video also discusses the real-world application of transformers in electricity transmission, highlighting the importance of high voltage for efficient power transfer and the need for step down transformers for safety in homes.

What is the primary function of a transformer?

• To store electrical energy

• To change the voltage of an alternating current supply

• To convert direct current to alternating current

• To generate electricity

Which component of a transformer is responsible for inducing a magnetic field?

• The soft iron core

• The primary coil

• The secondary coil

• The alternating current

In a step-up transformer, how does the number of turns in the secondary coil compare to the primary coil?

• Both coils have the same number of turns

• The number of turns does not matter

• The secondary coil has fewer turns

• The secondary coil has more turns

What is the output voltage of a transformer if the primary voltage is 30 volts, the primary coil has 20 turns, and the secondary coil has 5 turns?

• 30 volts

• 15 volts

• 60 volts

• 7.5 volts

Why are step-down transformers used before electricity enters homes?

• To increase the current

• To reduce the voltage to safer levels

• To store energy for later use

• To convert AC to DC