why transformers hum

The video tutorial explains how magnetic fields in generators push and pull electrons, causing alternating current (AC) and resulting in a sine wave pattern. It discusses the frequency of AC in different regions and how transformers work by transferring voltage between coils. The video also covers transformer efficiency, the role of iron cores, and energy losses due to eddy currents, resistance, and vibrations. Finally, it concludes with a brief thank you to viewers.

What causes the electrons in a wire to alternate direction in a generator?

• The resistance of the wire

• The voltage applied to the wire

• The temperature of the environment

• The magnetic field inside the generator

How does a transformer change the voltage?

• By increasing the current

• By using a second coil and magnetic field

• By altering the frequency

• By changing the wire material

What is the purpose of a ferromagnetic iron core in a transformer?

• To eliminate resistance

• To concentrate the magnetic field

• To increase the frequency

• To reduce the voltage

What are eddy currents and how do they affect transformers?

• They are currents that increase efficiency

• They are currents that reduce resistance

• They are currents that cause heat and energy loss

• They are currents that stabilize voltage

Why do transformers produce a humming sound?

• Because of the wire material

• Due to the expansion and contraction of sheets

• Because of the high voltage

• Due to the cooling system