Electrical Transformers

In order for electromagnetic induction to occur, there must be relative............between a magnetic field and a conductor.

• race

• Motion

• field

• voltage

Tags

NGSS.HS-PS2-5

The magnetic field produced by an alternating current can be thought of as a ............................... magnetic field.

• moving magnetic field

• dynamic magetic field

• electrodynamic magnetic field

• magnetic field

Tags

NGSS.HS-PS2-5

The transformer is a device used to .......... the value of a voltage.

• steady

• resist

• change

• anchor

Tags

NGSS.HS-PS3-3

If a transformer reduces voltage, it is called a....................... transformer.

• step left

• step right

• step up

• step down

Tags

NGSS.HS-PS3-3

A laminated transformer core reduces the amount of energy that is wasted in the form of........

• solidifying

• flux

• heat

Tags

NGSS.HS-PS3-4

Why transformers work with A.C. current but not D.C.

• A.C current produces changing magnetic field.

• D.C current produces changing magnetic field.

• D.C current is weak

• A.C current is powerful

Tags

NGSS.HS-PS2-5

Which of the following does not change in a transformer?

• Voltage

• Current

• Power

• Frequency

This picture is an example of a ________________.

• Motor

• Generator

• Step-up transformer

• Step-down transformer

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-3

Ratio of voltages is equal to ratio of _______________________.

• number of iron sheets in core

• number of coil

• number of turns in coil

• number of electromagnetic

A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?

• 480V

• 30V

• 20V

• 450V

Tags

NGSS.HS-PS3-5