Electromagnetic Induction Practice Quiz

An ideal transformer has 12 V input voltage with 10 turns on the primary (input) coil, The secondary coil has 100 turns. What is the secondary voltage?

• 0.12 V
• 1.20 V 
  1.20 V
• 12.0 V
• 120.0 V

A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage 

• quadruples
• doubles
• is the same
• halves

The phenomenon of inducing voltage by changing the magnetic field around a conductor is called

• generated voltage
• Faraday's induction
• transformer induction
• electromagnetic induction

A device consisting of a coil that is mechanically rotated in a stationary magnetic field is called

• a transformer
• a motor
• a generator
• a dipole

A generator is used to light a bulb.  Energy for lighting the bulb actually comes from a

• coil or wire
• mechanical intput to the generator
• magnet in the generator
• plug where the generator is connected to the wall

Tags

NGSS.HS-PS3-3

A device that uses two coils around an iron core to change the voltage across a circuit is called a 

• voltmeter
• diode
• transformer
• generator

The primary coil of a transformer has 80 turns on it, and the secondary coil has 40 turns on it.  This is 

• a step-up tansformer
• a step-down transformer
• either of the above depending on the relative input and output currents.

The voltage across the primary coil of a transformer that has 75 turns on it is 100 V.  What is the voltage across the secondary coil, which has 15 turns on it?

• 500 V
• 25 V
• 125 V
• 20 V

If a transformer increases AC voltage, it will also increase

• power
• energy
• megnetic field strength
• none of the above

In a vacuum, electromagnetic waves travel at speeds

• greater than the speed of light.
• equal to the speed of light.
• less than the speed of light.