Science: Middle School: Grades 6, 7 and 8 Quiz - Electrical Circuits 3 (Questions)

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Insulators and conductors are words used in relation to electrical circuits. A bolt of lightning can measure up to three million volts and lasts less than one second! The irrational fear of lightning (and thunder) is known as astraphobia.

Test your knowledge on all things electrical in this quiz.

1. If the size of a battery in a complete circuit increases .......
[ ] the current decreases
[ ] the current increases
[ ] the current stays the same
[ ] the voltage stays the same
2. Two bulbs are in series in a complete circuit. If the voltage increases .......
[ ] the bulbs get brighter and the current decreases
[ ] the bulbs get brighter and the current increases
[ ] the bulbs get dimmer and the current decreases
[ ] the bulbs get dimmer and the current increases
3. Two identical bulbs are in parallel in a complete circuit. If one breaks .......
[ ] the other bulb is brighter
[ ] the other bulb is dimmer
[ ] the other goes off
[ ] the other stays on
4. Two identical bulbs are in parallel in a complete circuit. A third identical bulb is connected in parallel. What happens?
[ ] All the bulbs are dimmer
[ ] All the bulbs are the same brightness
[ ] The third bulb is brighter
[ ] The third bulb is dimmer
5. The current in a series circuit containing two bulbs .......
[ ] is larger between the bulbs
[ ] is larger nearer the battery
[ ] is smaller nearer the battery
[ ] is the same at every place in the circuit
6. Three identical bulbs are in parallel in a complete circuit. The current in each bulb .......
[ ] is different in all bulbs
[ ] is greatest in the bulb nearest the battery
[ ] is the same
[ ] is three times the current flowing from the battery
7. Which of the following statements is true?
[ ] A voltmeter is connected in series to measure voltage
[ ] An ammeter is connected in parallel to measure current
[ ] Different sized bulbs in parallel have a different sized current flowing through them
[ ] In a series circuit the current through different bulbs adds up to current coming from the battery
8. Which of the following statements is true?
[ ] A flow of electrons around a circuit is called an electric current
[ ] A switch only turns the current off
[ ] An open switch allows a small amount of current through it
[ ] Two identical bulbs in a series circuit are brighter than one
9. Wires are usually coated in plastic because .......
[ ] plastic can be lots of different colors
[ ] plastic helps the wires bend
[ ] plastic helps the wires conduct electricity
[ ] plastic is an insulator
10. Wires are normally made from copper. This is because .......
[ ] copper has a high resistance
[ ] copper is a very good conductor of electricity
[ ] copper is cheap
[ ] copper is expensive
Science: Middle School: Grades 6, 7 and 8 Quiz - Electrical Circuits 3 (Answers)
1. If the size of a battery in a complete circuit increases .......
[ ] the current decreases
[x] the current increases
[ ] the current stays the same
[ ] the voltage stays the same
The voltage also increases
2. Two bulbs are in series in a complete circuit. If the voltage increases .......
[ ] the bulbs get brighter and the current decreases
[x] the bulbs get brighter and the current increases
[ ] the bulbs get dimmer and the current decreases
[ ] the bulbs get dimmer and the current increases
3. Two identical bulbs are in parallel in a complete circuit. If one breaks .......
[ ] the other bulb is brighter
[ ] the other bulb is dimmer
[ ] the other goes off
[x] the other stays on
4. Two identical bulbs are in parallel in a complete circuit. A third identical bulb is connected in parallel. What happens?
[ ] All the bulbs are dimmer
[x] All the bulbs are the same brightness
[ ] The third bulb is brighter
[ ] The third bulb is dimmer
Adding identical bulbs in parallel uses more current but brightness stays the same
5. The current in a series circuit containing two bulbs .......
[ ] is larger between the bulbs
[ ] is larger nearer the battery
[ ] is smaller nearer the battery
[x] is the same at every place in the circuit
6. Three identical bulbs are in parallel in a complete circuit. The current in each bulb .......
[ ] is different in all bulbs
[ ] is greatest in the bulb nearest the battery
[x] is the same
[ ] is three times the current flowing from the battery
The current in each bulb is a third of the current from the battery
7. Which of the following statements is true?
[ ] A voltmeter is connected in series to measure voltage
[ ] An ammeter is connected in parallel to measure current
[x] Different sized bulbs in parallel have a different sized current flowing through them
[ ] In a series circuit the current through different bulbs adds up to current coming from the battery
Current stays the same in a series circuit
8. Which of the following statements is true?
[x] A flow of electrons around a circuit is called an electric current
[ ] A switch only turns the current off
[ ] An open switch allows a small amount of current through it
[ ] Two identical bulbs in a series circuit are brighter than one
9. Wires are usually coated in plastic because .......
[ ] plastic can be lots of different colors
[ ] plastic helps the wires bend
[ ] plastic helps the wires conduct electricity
[x] plastic is an insulator
10. Wires are normally made from copper. This is because .......
[ ] copper has a high resistance
[x] copper is a very good conductor of electricity
[ ] copper is cheap
[ ] copper is expensive