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The plastic coating on electrical wires is an insulator.
Electrical Circuits 3
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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.
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
Adding identical bulbs in parallel uses more current but brightness stays the same
2.
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
3.
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
The voltage also increases
4.
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
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.
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
7.
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
The current in each bulb is a third of the current 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.
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
Current stays the same in a series circuit
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
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