Sources of Electricity

Which material is used as the core in both step-up and step-down transformers?

• carbon

• cobalt

• iron

• steel

Which type of transformer are used in these examples?

• A

• B

• C

• D

Tags

NGSS.HS-PS2-5

The transformer shown has two coils of wire wrapped around a metal core.

Which statement about the transformer is correct?

• The core is made from copper.

• The current in both coils is the same.

• The input and output voltages are different.

• The transformer will work from a DC supply.

Tags

NGSS.HS-PS2-5

Which diagram shows the structure of a transformer?

• A

• B

• C

• D

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Which row correctly describes the roles of different parts of the system that provides electrical energy to homes?

• A

• B

• C

• D

Tags

NGSS.MS-ETS1-1

What can cause a very large current in a household wiring system?

• circuit breaker

• connecting too many appliances to one socket

• poor or loose connections

• the wrong fuse rating

Tags

NGSS.MS-ETS1-1

What is the function of a transformer?

• to change the current of an alternating current supply

• to change the voltage of an alternating current supply

• to reduce the power loss in cables

• to reverse the direction of current

Which of the following is a cause of electrical hazards?

• circuit breaker

• damp conditions

• earth wire

• fuse

What is the reason for electrical energy to be transmitted at high voltage from the power station to the houses?

• to allow the use of cheaper cables

• to have a higher current flowing in the transmission cables

• to reduce energy loss

• to reduce the chances of the cables catching fire

The diagram below shows a transformer. What are the possible values for the input and output voltage?

• A

• B

• C

• D

Tags

NGSS.HS-PS3-5