Unit 3 Lesson 5 Electromagnetism

Which of the following best describes how a powerful electromagnet could be used in a junkyard?

• It could move heavy objects made of iron.

• It could convert electrical energy into mechanical energy.

• It could light up the area so workers can see at night.

• It could provide a voltage source for old electronic equipment.

What is the best word to describe a system in which a magnet moves in a coil of wire to produce electricity?

• electromagnet

• generator

• motor

• transformer

The interaction between electricity and magnetism has been an important topic in 20th century science. Which term describes this interaction?

• electromagnetism

• ferromagnetic

• magnetic field

• static electricity

Observe the electromagnet below: Electric current flows through the wire. What is the name for this coiled wire that is wrapped around the iron core of the electromagnet?

• generator

• solenoid

• transformer

• trapezoid

Daniel has a long piece of copper wire. He shapes the wire into a coil. What could Daniel do to cause electric current to flow through the wire?

• shake the wire very quickly

• submerge the wire into a pan of hot water

• move a bar magnet in and out of the wire coil

• connect the two free ends of the wire so that they form a closed path