Transformers Number of Coils

If a secondary coil has 40 turns, and, a primary coil with 20 turns is charged with 50 V of potential difference, then potential difference in secondary coil would be

• 50 V in secondary coil
• 25 V in secondary coil
• 60 V in secondary coil
• 100 V in secondary coil

Ratio of voltages is equal to ratio of

• iron sheets in core
• coil
• number of turns in coil
• all of above

Will a transformer work with direct current (d.c.) or alternating current (a.c.)?

• a.c. only
• d.c. only
• Both a.c. and d.c.

Tags

NGSS.HS-PS2-5

What is meant by a step down transformer?

• One where the output voltage is the same as the input voltage.
• One where the output voltage is larger than the input voltage.
• One where the output voltage is smaller than the input voltage.

In large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.

• Wind
• Water
• Magnets
• Circuits

Tags

NGSS.HS-PS2-5

This picture is an example of a ___________

• Step- Up Transformer
• Step- Down Transformer
• Motor
• Generator

Tags

NGSS.HS-PS2-5

Based on this picture, which side will have a higher voltage?

• Secondary
• Primary
• Both sides have the same voltage
• Cannot be determined

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

• voltmeter
• diode
• transformer
• generator

Tags

NGSS.HS-PS2-5

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.