Electrical Circuits & Work

In which circuit will the light(s) be on?

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An incandescent bulb placed in a closed circuit works by allowing electrons to travel through a very thin piece of wire in the bulb. The bulb will then give off infrared radiation. This is an example of

• kinetic energy being transformed into potential energy.

• electrical energy being transformed in heat and light energy.

• magnetic energy being transformed into electrical energy.

• electrical energy being transformed into mechanical energy.

The diagrams show force being applied to two objects. Which conditions indicate that work was not done?

• X because the box moved, unlike Z

• X because the box had less mass and more force than Z

• Z because the box had more mass and less force than X

• Z because the box was pushed by two equal forces, unlike X

The diagrams show forces applied to an object. Which diagram shows the most work being done?

• W

• X

• Y

• Z

A series circuit consists of four light bulbs. If the first light bulb burns out, what will most likely happen to the other light bulbs?

• The other light bulbs will be 1/3 brighter.

• The other light bulbs will get 1/4 dimmer.

• The other light bulbs will blink on and off.

• The other light bulbs will all go out.

Which change will occur in the wire of an electrical circuit that is working properly?

• The wire will become warmer.

• The wire will lose some of its mass.

• The wire will form an electric field.

• The wire will develop a new crystal structure.

Current moving through a circuit is stopped with a

• wire

• battery

• switch

• bulb

What form of energy is stored in a battery?

• chemical

• sound

• light

• heat

When a battery is attached to a circuit,

• the electricity stays in the battery.

• all the electricity empties into the circuit.

• the electricity goes around the circuit and back to the battery.

• some of the electricity goes into the circuit, and the rest stays in the battery.

A light bulb is connected to a battery by a wire as shown. What happens when the wire is removed from the light bulb?

• The light bulb stops shining.

• The wire produces electricity.

• The light bulb glows brighter.

• The battery loses power.