Understanding the Turns Ratio Equation in Transformers

This video tutorial explains how the potential difference across the primary and secondary coils of a transformer depends on the number of turns of wire in each coil. It introduces the turns ratio equation and demonstrates its application through examples with different configurations of coil turns. The tutorial shows how to calculate the potential difference across the secondary coil when the number of turns on the primary and secondary coils varies.

What is the primary function of a transformer?

• To store electrical energy

• To measure electrical resistance

• To increase or decrease the potential difference of an alternating current

• To convert direct current to alternating current

Which of the following variables is NOT part of the turns ratio equation?

• Potential difference across the primary coil

• Number of turns on the secondary coil

• Current through the primary coil

• Potential difference across the secondary coil

In a transformer with equal turns on both coils, what happens to the potential difference across the secondary coil?

• It halves

• It remains the same as the primary coil

• It doubles

• It becomes zero

If a transformer has 14 turns on the primary coil and 7 turns on the secondary coil, what is the potential difference across the secondary coil if the primary coil has 110 volts?

• 165 volts

• 220 volts

• 55 volts

• 110 volts

What is the potential difference across the secondary coil when the primary coil has 7 turns, the secondary coil has 14 turns, and the primary potential difference is 110 volts?

• 55 volts

• 110 volts

• 220 volts

• 165 volts

How does the potential difference across the secondary coil compare to the primary coil when the secondary coil has twice as many turns?

• It is the same as the primary potential difference

• It is half the primary potential difference

• It is three times the primary potential difference

• It is twice the primary potential difference

What happens to the potential difference across the secondary coil if the number of turns on the primary coil is doubled while keeping the secondary coil constant?

• It doubles

• It halves

• It remains the same

• It becomes zero