Transformer Functions and Characteristics

This video tutorial explains the use of transformers in changing the potential difference of an electricity supply, focusing on step-up and step-down transformers. It covers the structure and functionality of transformers, emphasizing the role of alternating current and the importance of the iron core. The video also discusses the efficiency of transformers and provides examples of different transformer types. The tutorial is aimed at triple physics higher-tier students and sets the stage for further exploration of transformer calculations in the next video.

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

• To change the potential difference

• To convert AC to DC

• To generate electricity

• To store electrical energy

In a transformer, what is the role of the iron core?

• To conduct electricity

• To increase the strength of the magnetic field

• To insulate the coils

• To convert AC to DC

Why do transformers require alternating current to function?

• Because AC is cheaper

• Because AC creates a changing magnetic field

• Because AC is more efficient

• Because AC is safer

What is the efficiency of a transformer if there is no energy wasted?

• 75%

• 50%

• 25%

• 100%

Which type of current does not work with transformers?

• Static current

• Pulsating current

• Direct current

• Alternating current

What happens to the potential difference in a step-up transformer?

• It decreases

• It remains the same

• It increases

• It fluctuates

In a step-up transformer, if the secondary coil has twice the number of turns as the primary coil, what happens to the potential difference?

• It remains the same

• It is doubled

• It is tripled

• It is halved

What is the relationship between the number of turns in the coils and the potential difference in a transformer?

• More turns in the primary coil increase potential difference

• Number of turns does not affect potential difference

• More turns in the secondary coil decrease potential difference

• More turns in the secondary coil increase potential difference

What is the main characteristic of a step-down transformer?

• It stores electrical energy

• It converts AC to DC

• It decreases the potential difference

• It increases the potential difference

In a step-down transformer, if the secondary coil has half the number of turns as the primary coil, what happens to the potential difference?

• It is tripled

• It is doubled

• It remains the same

• It is halved