Understanding Transformers

What is the primary function of a transformer?

• To convert AC to DC

• To transform one voltage level to another

• To store electrical energy

• To generate electricity

Where can you commonly find transformers in everyday life?

• Inside a computer

• In a power station

• In a car engine

• In a refrigerator

What is the role of the iron core in a transformer?

• To provide insulation

• To magnetically link the coils

• To electrically link the coils

• To increase resistance

How are the primary and secondary coils of a transformer linked?

• Magnetically

• Electrically

• Mechanically

• Chemically

According to Faraday's law, what is the induced EMF on the primary side of a transformer?

• Equal to the change in magnetic flux over time

• Equal to the number of windings on the secondary side

• Equal to the number of windings on the primary side times the change in flux over time

• Equal to the voltage on the secondary side

What does the ratio of secondary to primary voltage depend on?

• The frequency of the AC current

• The ratio of the number of windings on the secondary to primary coil

• The number of windings on the secondary coil

• The number of windings on the primary coil

What happens to the voltage if the number of windings on the secondary coil is greater than on the primary coil?

• The voltage fluctuates

• The voltage remains the same

• The voltage decreases

• The voltage increases

In a step-down transformer, how does the number of windings on the secondary coil compare to the primary coil?

• More windings on the secondary

• Fewer windings on the secondary

• Equal windings on both

• No windings on the secondary

What is the relationship between current and the number of windings in a transformer?

• More windings on the secondary means more current

• More windings on the secondary means less current

• More windings on the primary means less current

• Windings do not affect current

What is the efficiency assumption made for an ideal transformer?

• 25% efficient

• 100% efficient

• 75% efficient

• 50% efficient