Transformers Quiz

What is the purpose of transformers in electricity supply?

• To generate electricity

• To store electricity

• To change the potential difference

• To conduct electricity

What are the two types of transformers mentioned in the text?

• Primary and Secondary

• Step-up and Step-down

• Direct and Alternating

• Iron and Copper

Why do transformers only work with alternating current?

• Because it is cheaper

• Because it is easier to use

• Because it produces a changing magnetic field

• Because it is more efficient

What material is used for the core of a transformer?

• Copper

• Aluminum

• Iron

• Steel

What happens when a changing magnetic field passes through the secondary coil?

• It induces a potential difference

• It generates electricity

• It increases the resistance

• It stops the flow of current

What is the condition for the potential difference in the primary and secondary coils to be the same?

• Same number of turns in both coils

• Different number of turns in both coils

• Different materials used in both coils

• Different sizes of the coils

What type of transformer steps up the potential difference?

• Step-down transformer

• Primary transformer

• Step-up transformer

• Secondary transformer

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 fluctuates

• It remains the same

• It increases

• It decreases

What is the efficiency of transformers in practice?

• 50%

• Less than 100%

• 75%

• 100%