Chapter 7 Test Review

When you bring the south ends of two magnets close together, they repel each other.

• True
• False

Tags

NGSS.MS-PS2-5

The strength of an electromagnet can be increased by reducing the number of turns on the wire coil.

• True
• False

An electric motor is used to change mechanical energy into electrical energy.

• True
• False

Tags

NGSS.HS-PS3-3

Moving a wire through a magnetic field creates an electrical current in the wire.

• True
• False

Tags

NGSS.HS-PS2-5

Before alternating current from a power plant can enter a home, its voltage must be boosted or increased

• True
• False

Paper clips and other objects that contain iron can become permanent magnets.

• True
• False

Tags

NGSS.MS-PS2-5

A magnetic field exists around any current carrying wire.

• True
• False

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A coil of wire carrying a current has a magnetic field.

• True
• False

Tags

NGSS.HS-PS2-5

A device that increases or decreases voltage in a power line is a ____.

• commutator
• generator
• motor
• transformer

Current that does NOT reverse direction is called ____.

• alternating current
• circuit current
• direct current
• magnetic current