Transformers

What type of transformer is D?

• Step up

• Step down

Tags

NGSS.HS-PS2-5

Why do we need transformers on the electrical grid? (Two of these options are correct)

• To step up the voltage and lower the current which reduces heat loss over long distances

• To step down the voltage and increase the current which reduces heat loss over long distances

• To step down the voltage and increase the current which makes the electrical power safer for use in the community

• To step up the voltage and decrease the current which makes the electrical power safer for use in the community

Tags

NGSS.HS-ETS1-3

What type of transformer is a location D?

• step up

• step down

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-3

If there's 240V @ 8A on primary, the secondary will have...

• 240V @ 4A

• 120V @ 4A

• 480 V @ 4 A

• 120V @ 16 A

The output of a transformer's secondary is measured at 60 V @ 20 A.

Which option below is possible?

• 180 V @ 6.7 A

• 20 V @ 2 A

• 60 V @ 0.67 A

• 6 V @ 20 A

If a transformer uses a 240 V primary winding that has 400 turns and a secondary that has 200 turns, what would be the voltage of the secondary winding?

• 200 V

• 120 V

• 480 V

• none of the above

Tags

NGSS.HS-PS3-3

When there is voltage at the primary side of a transformer and no voltage at the secondary, what could be the problem with the transformer?

• a bad secondary winding only

• a bad primary winding only

• a bad secondary or primary winding

• a bad fuse at the power supply

Step-up transformers do what?

• Increase V / decrease I

• Increase V & I

• Decrease V / increase I

• Decrease V & I

Tags

NGSS.HS-PS3-3

Primary = 600 V and Secondary = 150 V

This transformer ratio is...

• 1:4

• 6:1.5

• 4:1

• 600: 150

Primary = 120 VAC @ 4 A

Secondary = 8 A and how many volts?

• 240 VAC

• 60 VDC

• 120 VAC

• 60 VAC