Understanding Transformers and Their Functions

The video explains how devices with different voltage requirements, like microwaves and phones, can operate using the same power supply through transformers. It introduces transformers as devices that can step up or step down AC voltage using electromagnetic induction. The video details the working principle of transformers, including the role of primary and secondary coils, and how they enable voltage transformation. It also discusses practical applications, such as in microwaves and wireless charging, and addresses limitations like the inability to work with DC supply. The use of a ferromagnetic core to enhance transformer efficiency is also covered.

What is the main function of a transformer in electrical devices?

• To convert AC to DC

• To generate electricity

• To adjust voltage levels

• To store electrical energy

What are the two main components of a transformer?

• Primary and Secondary Coils

• Battery and Switch

• Diode and Transistor

• Capacitor and Resistor

According to Faraday's law, what induces an EMF in a coil?

• Static electricity

• Constant magnetic field

• Changing magnetic flux

• Direct current

What is the primary principle behind the operation of transformers?

• Electromagnetic induction

• Chemical reaction

• Nuclear fusion

• Thermal conduction

How can you increase the voltage in a transformer?

• Decrease the number of turns in the secondary coil

• Increase the number of turns in the primary coil

• Use a larger core

• Increase the number of turns in the secondary coil

What happens to the voltage if the secondary coil has fewer turns than the primary coil?

• The voltage fluctuates

• The voltage remains the same

• The voltage decreases

• The voltage increases

What type of transformer is used to charge mobile phones?

• Step-up transformer

• Step-down transformer

• Isolation transformer

• Auto transformer

What is a key advantage of wireless charging?

• It charges devices faster

• It allows charging without direct contact

• It requires no electricity

• It is cheaper than wired charging

Why can't transformers be used with DC supply?

• DC does not change, so no induction occurs

• DC supply is too weak

• DC is not compatible with coils

• DC is too expensive

What role does a ferromagnetic core play in a transformer?

• It reduces energy loss

• It ensures consistent magnetic flux

• It increases the resistance

• It stores electrical energy