Understanding Transformers

This video tutorial explains what electrical transformers are and how they function. It covers the basics of alternating current (AC) and how transformers can change voltage levels. The video details the components of transformers, including primary and secondary coils, and explains the difference between step-up and step-down transformers. It also provides a practical example of calculating voltage in a transformer. Finally, the video discusses the real-world application of transformers in electricity transmission, highlighting their role in reducing energy loss and ensuring safe voltage levels for home use.

What is the primary function of a transformer in an electrical circuit?

• To measure electrical resistance

• To convert direct current to alternating current

• To store electrical energy

• To change the voltage level of an alternating current

Which component of a transformer is typically made of iron?

• Secondary coil

• Soft metal core

• Primary coil

• Insulation layer

What is induced in the secondary coil of a transformer?

• Static electricity

• Magnetic field

• Direct current

• Alternating current

What is the role of alternating current in a transformer?

• It stores electrical energy

• It measures voltage

• It induces a changing magnetic field

• It creates a static magnetic field

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

• More turns in the secondary coil

• Equal turns in both coils

• Fewer turns in the secondary coil

• No turns in the secondary coil

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

• 60 volts

• 15 volts

• 7.5 volts

• 30 volts

Why are step-up transformers used in electricity transmission?

• To decrease voltage

• To increase current

• To store energy

• To reduce energy loss as heat

What is a potential danger of high voltage in power lines?

• Increased energy efficiency

• Reduced power supply

• Dangerous for home use

• Increased magnetic field

What is the purpose of a step-down transformer before electricity enters homes?

• To increase voltage

• To decrease voltage to safer levels

• To convert AC to DC

• To store electrical energy

What happens to energy when current flows through a wire?

• It is lost as heat

• It is lost as light

• It is completely conserved

• It is converted to sound