Electric Circuits Answers
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Jamal draws the circuit diagram shown.
A
one battery, two switches, two resistorsB
two batteries, three switches, two resistorsC
one battery, four switches, one resistorD
two batteries, three switches, two resistors2
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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.3
A large cooler is filled with water, as shown below.
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.4
Which device provides electrical energy to run an electric circuit?
A
the wireB
the switchC
the batteryD
the light bulb5
Roshan describes the basic parts of an electric circuit using a shower as a model. Which part of a circuit does the water pipe represent?
A
the wireB
the switchC
the batteryD
the resistor6
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.7
Which would cause an electric circuit to lack a current?
A
open switchB
closed switchC
lighted bulbsD
unlighted bulbs8
Patty makes a table of the symbols used for the parts of an electric circuit.
A
BatteryB
SwitchC
ResistorD
Bulb9
Look at the circuit diagram.
A
one battery, two light bulbs, and three resistorsB
one battery, two switches, and three light bulbsC
one switch, one resistor, and three light bulbsD
one switch, one light bulb, and three batteries10
What symbol would best represent an electric fan speed controller in an electric circuit?
A
OptionB
OptionC
OptionD
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