What name is given to a material that lets electric current pass through it easily?

How do electric charges behave in a good insulator?

Why is copper often used inside electrical wires?

What material is suitable for the protective covering on an electrical wire?

What substance in a pencil can carry electric current?

Predict what happens to the lamp when a bare steel paper clip fills the test gap, assuming suitable, working parts and firm connections.

The pictured circuit has suitable, working parts and firm connections. What happens to lamp L when the rubber eraser fills the gap?

Liza sorts a bare metal coin and a dry plastic cup by their ability to carry electric current. How should she classify them?

What kind of path must connect both battery terminals through a working bulb for the bulb to light?

In the pictured circuit, what change would allow current through lamp L?

To connect a small bulb without a holder, where should the two battery wires touch?

Which teacher-made change allows this plastic-coated copper wire to make an electrical connection with the battery?

What particles move through copper when electric current flows?

In the simulation, Ana increases battery voltage within the bulb's safe range without changing the bulb or wires. How does its light usually change?

Before testing objects, Paolo finds that his circuit stays dark even with copper across the gap. What should he do first?

To compare two test materials fairly, what should Rosa change between trials?

In a working battery circuit, which observation provides evidence that the test object conducts electricity?

Why should a wire never connect a battery's two terminals directly without a bulb or other device?

What power source should pupils use for supervised classroom tests of household materials?

Why should pupils avoid using their bodies to bridge gaps in electrical circuits?