A student joins a battery, two wires, and a small bulb, and the bulb lights up. What must be true about the path the electric current follows?

The cord on a lamp has copper wire inside and a plastic covering outside. Why do makers put the plastic covering on the cord?

A student puts a metal paper clip, a rubber band, a dry wooden stick, and a glass bead one at a time into a gap in a circuit. Which object lights the bulb?

A flashlight shines until its switch is turned off, and then the light goes out. What does turning the switch off do to the circuit?

A lamp is switched on and the bulb glows. Some of the energy carried to the bulb by the electric current leaves it as light. What else does the bulb give off?

An electric fan is switched on and its blades spin quickly. What does the fan mainly convert the energy carried by the electric current into?

A visitor presses the button beside a door and a bell rings inside the house. How does the energy travel from the button to the bell?

In a circuit made of a battery, wires, and a bulb, what job does the battery do?

Electricians often wear thick rubber gloves when they work near electric wires. Why do the rubber gloves help keep them safe?

A battery has two metal ends where wires can be attached to complete a circuit. What are these two ends called?

What do we call a material that does not let electric current pass through it easily?

Electric devices should be kept away from sinks and bathtubs because water can conduct electric current.

A circuit has one battery and one glowing bulb. A student adds a second bulb in the same loop. What happens to the bulbs?

If a wire is disconnected and there is a gap in the circuit, the bulb will usually go out.

Which object is the energy source in a simple flashlight circuit?

Which material is usually a good conductor of electricity?

Which material is usually an electrical insulator?

What is the job of a switch in a circuit?

A small gap in a circuit only slows the current down, so the bulb still lights, just more dimly.

Which item would most likely let electricity flow through it?

After a storm, a student sees a power line lying on the ground. What is the safest thing to do?

A toaster changes most of the energy carried by electric current into heat.

Which circuit part changes electrical energy into light?

Silver is a metal that is sometimes used to make jewelry and electrical wires. Which best describes silver?

All materials conduct electricity equally well.

Which pair lists only conductors?

Which pair lists only insulators?

What is an open circuit?

A shiny plastic-coated paper clip placed in the gap of a circuit will light the bulb because it looks like metal.

Which action would make a simple bulb circuit work?

Why should you never put objects into an electrical outlet?

A metal doorknob could give a person an electric shock if it touched a bare wire carrying current, because metal is a good conductor of electricity.

What does it mean if a material is a conductor?

What does it mean if a material is an insulator?

Which part of a simple circuit carries electric current from place to place?

If the battery is missing from a simple circuit, the bulb will still light normally.

Which test would best show whether a small object is a conductor?

A wooden ruler placed in the gap of a circuit will light the bulb because wood is hard and solid.

What usually happens when a switch is closed in a working circuit?

Which choice is the safest way to investigate conductors and insulators in class?