If a 60 Hz transformer is connected to a 120...

🔍 Key Concepts

• Transformer reactance and frequency: How inductive reactance changes when frequency increases while voltage stays the same • Core flux and saturation: How core flux density in a transformer depends on applied voltage and frequency (E = 4.44 f N Φmax) • Current, impedance, and power to the load: Relationship between source frequency, transformer impedance, and load current/power

💭 Think About

• When frequency is doubled but voltage is held constant, what happens to the transformer’s core flux and how does that affect saturation risk? • How does the inductive reactance of the windings change when frequency doubles, and what does that do to the current for the same voltage? • If current through the transformer changes while the load is the same type, how will power delivered to the load be affected?

✅ Before You Answer

• Verify how inductive reactance (X_L = 2πfL) changes when frequency goes from 60 Hz to 120 Hz • Consider whether higher or lower flux density occurs at higher frequency for the same applied voltage, and what that means for transformer operation • Check whether changes in impedance and current logically lead to a change in power delivered to the load before deciding if all statements can be true simultaneously

If a 60 Hz transformer is connected to a 120 Hz source of the same voltage:

The impedance of the transformers would be greater

The current would be reduced

There would be a decrease in power delivered to the load

All the above

🔍 Key Concepts

💭 Think About

✅ Before You Answer