5.4 Electricity and Circuits

Why is a bulb brighter when it is powered by two batteries rather than one?

• Because the flow of electricity in the circuit is less
• Because the flow of electricity in the circuit is the same
• Because the flow of electricity in the circuit is greater

Observe the circuit shown in the picture. Which procedure can a student use to turn on the green and red lights only?

• F. The student cannot follow any procedure to turn on the green and red lights only.

• G. The student can close switch A and switch C, but leave switch B open.

• H. The student can close switch A and switch B, but leave switch C open.

• J. The student can close switch B and switch C, but leave switch A open.

Observe the diagram. How many bulbs would turn on if a student closed switch C and switch D?

• A. 0 bulbs

• B. 1 bulb

• C. 2 bulbs

• D. 3 bulbs

Why is electrical wiring usually made from copper?

• Because copper is shiny
• Because copper conducts electricity
• Because copper is not magnetic

A student designed the circuit shown in the picture. The bell is on, and both bulbs are lit. What could the student do to turn the bell off, but keep the bulbs lit?

• A. Remove Wire 1 only

• B. Remove Wire 3 and Wire 5

• C. Remove Wire 2 only

• D. Remove Wire 1 and Wire 3

What kind of circuit is this?

• Open Circuit

• Closed Circuit

Study the picture carefully. A student designed the circuit shown. What would most likely happen if the student closed Switch 1, Switch 2, and Switch 4?

• F. Bulb A would light up and the bell would ring, but Bulb B would not light up.

• G. Bulb B would light up, but Bulb A would not light up and the bell would not ring.

• H. Neither of the bulbs would light up, and the bell would not ring.

• J. Both of the bulbs would light up, but the bell would not ring.

Which answer choice has one that does not belong?

• copper penny, steel nail, tin can

• plastic cup, cloth towel, styrofoam cup

• brass cup, rubber eraser, silver cross

• iron rod, aluminum foil, gold ring

If you replace the paper clip with a plastic spoon, what happens?

• The bulb doesn't light
• The bulb is dimmer
• The wires get hot
• There is no change

Study the picture carefully. A student designed the circuit shown. Which switches should the student close to produce sound energy only?

• A. Switch 1 and 3

• B. Switch 1, 2, and 3

• C. Switch 1 and 4

• D. Switch 2 and 3