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Constructed Response Question
Use the following diagram to answer the question below.
Wire
Wire wrapped
around an iron
nail.
Battery
Switch
When the switch is closed, an electromagnet will be formed.
A. Circle the electromagnet in the picture. The wire-wrapped nail is the
electromagnet.
B. Explain what an electromagnet is. An electromagnet is a magnet created by an
electrical field. An electromagnet is formed when electricity creates a
magnetic field around a metal like iron that can be magnetized.
C. Why must the switch be closed in order for the electromagnet to work?
Closing the switch allows the electricity to flow. Electricity will not flow if
the switch is not closed. When the electricity flows the electromagnet will
work. Electricity is needed to make the nail magnetic/create the magnetic
field.
Constructed Response Question
Number of turns
in the coil of wire
of an electromagnet.
5
10
15
20
Number of paper clips
picked up by the
electromagnet.
2
4
8
10
The more turns of wire there are around the soft core of iron, the more paper clips the
electromagnet will pick up. Observe the data on the table and answer the question
below.
A. Construct a line graph comparing the number of turns of wire on the
electromagnet to the number of paper clips it can pick up.
The number of turns of wire on an
electromagnet vs. the number of paper
clips picked up.
Number of paper
clips picked up
10
8
6
4
2
0
0
5
10
15
20
25
Number of turns of wire
Graph must include a line graph showing the directly proportional relationship between
the number of turns of wire and the number of paper clips picked up. Data points on the
line must representing the number of turns of wire and the number of paper clips picked
up. Correct labels are need for both x-axis and y-axis.
B. Explain why the electromagnet picks up more nails as the number of coils
increases.
The electromagnet picks up more paper clips when there are more turns of wire around
the nail because the magnetic field becomes stronger.
Constructed Response Question
Series circuits are used to transfer energy from one place to another and transform energy
from one type to another.
A. Draw a series circuit using symbols. Make sure to include at least one energy
source, one switch, and two light bulbs.
+
KEY:
Circles with X drawn in are the lights
The two dark dots indicate a switch
The short and long line with a + and – indicates where the battery will go
Circuit is in a series, with no additional paths.
B. Then use arrows to show the direction of the electric current through the circuit
when it is complete.
Arrows are pointing away from the negative end and towards the positive end of
the circuit.
C. Explain how a parallel circuit would be different from the series circuit and
explain how it would be the same as a series circuit.
Series and parallel are the same except that a parallel circuit has more than one
path for the electric current to travel through. The arrows for the electric current
would stay the same, from the negative end of the battery, through the circuit,
back to the positive end. However, a parallel circuit would have more than one
path for the electric current to flow through.