Transformers

What do the lines around this magnet represent?

• North Pole
• South Pole
• Magnetic Declination
• Magnetic Field

A refrigerator magnet is an example of a:

• magnetic material
• permanent magnet
• horseshoe magnet
• temporary magnet

Which of the following shows the magnetic field correctly around a bar magnet?

• A
• B
• C
• D

A student sprinkled iron filings around a bar magnet and observed that the filings formed the pattern shown below. The magnetic field is strongest at point

• A
• B
• C
• D

The diagram below represents the magnetic lines of force around a bar magnet. At which point is the magnitude of the magnetic field strength of the bar magnet the weakest

• A
• B
• C
• D

Step up transformers...

• have more turns on their primary coil
• have more turns on their secondary coil
• have equal numbers of turns on their primary and secondary coil

This picture is an example of a ___________

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

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

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

The winding of wire around a core which is connected to a source of energy is called the ....... coil.

• primary

• secondary

• tertiary

Calculate potential difference in the secondary coil based on the information given below.

Vp = 240 V

Np = 20

Ns = 125

Vs ?

• 1500

• 500

• 1000

• 2000