AnswersFL-2003310-Physical Science CRElectric Circuits

Electric Circuits Answers

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1
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What symbol would best represent an electric fan speed controller in an electric circuit?

A
Option
B
Option
C
Option
D
Option
2
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A large cooler is filled with water, as shown below.

Question illustration
A
Opening the valve allows water to flow, just like opening a switch allows charges to flow.
B
Opening the valve stops the flow of water, but closing a switch stops the flow of charges.
C
Closing the valve stops the flow of water, but opening a switch stops the flow of charges.
D
Closing the valve allows water to flow, just like closing a switch allows charges to flow.
3

What is the main disadvantage of parallel circuits?

A
Any break in the circuit stops the flow of charges.
B
There are multiple paths for charges to flow.
C
If one bulb goes out, the other bulbs will go out.
D
They are complicated to design and build.
4

Which statement describes an open circuit?

A
The circuit is incomplete and broken, and the lights in the circuit shine.
B
The circuit is complete and unbroken, and the lights in the circuit shine.
C
The circuit is incomplete and broken, and the lights in the circuit do not shine.
D
The circuit is complete and unbroken, and the lights in the circuit do not shine.
5

Chang wants to build a circuit that will light up a bulb from a flashlight, and has a battery, switch, wire, and a light bulb.Which component would Chang use as the source of energy?

A
the battery
B
the switch
C
the wire
D
the light bulb
6

Patty makes a table of the symbols used for the parts of an electric circuit.

Question illustration
A
Battery
B
Switch
C
Resistor
D
Bulb
7

When an electric circuit operates, a buzzer makes a sound. What happens to the electric charges in this circuit?

A
The electric charges move from the energy source and are used up at the switch.
B
The electric charges move from the energy source and are used up at the buzzer.
C
The electric charges move from the buzzer through the energy source and back to the buzzer.
D
The electric charges move from the energy source through the buzzer and back to the energy source.
8

Jamal draws the circuit diagram shown.

Question illustration
A
one battery, two switches, two resistors
B
two batteries, three switches, two resistors
C
one battery, four switches, one resistor
D
two batteries, three switches, two resistors
9

A symbol from a circuit diagram is shown.

Question illustration
A
a switch
B
a light bulb
C
a wire
D
a battery
10

How does a parallel circuit change when a branch is added?

A
The total resistance increases, so the current in the circuit decreases.
B
The total resistance decreases, so the current in the circuit increases.
C
The total resistance increases, so bulbs shine at a lower brightness.
D
The total resistance decreases, so bulbs shine at a higher brightness.

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