Unit 4 Physical Science

Which describes the difference between the light bulbs in the series circuit and the light bulbs in the parallel circuit?

• All of the light bulbs are equally bright in both series circuits and parallel circuits

• In the parallel circuit all of the bulbs are equally bright and in the series circuit the brightness decreases as the current flows through each bulb

• In the series circuit all of the bulbs are equally bright and in the parallel circuit the brightness decreases as the current flows through each bulb.

• In series circuits the brightness of each bulb decreases as the current flows through each bulb and in parallel circuits the brightness of each bulb decreases as they are placed further from the battery

Mary wants to investigate the relationship between magnetism and the movement of an electrical charge. She has a coil of wire hooked to an ammeter to measure current. She has a moveable magnet inside the coil. As she moves the magnet within the coil, the ammeter indicates a certain current. Mary wants to increase the amount of current from the device. Which action would be the BEST to increase the current and why?

• Use a differently shaped magnet, because it would increase the magnetic field.

• Increase the diameter of coil, because more of the magnetic field will be included

• Reduce the number of coils because this would increase the effect of the magnetic field.

• Move the magnet faster within the coil, because this will increase the rate of change of the magnetic field.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

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• .34.50 volts

• 163 volts

• When the orientation of the magnet is reversed the current will change sign because the direction of the current changes as the orientation of the magnetic field changes.

• When the orientation of the magnet is reversed the current will remain the same because the direction of the current is not affected by the orientation of the magnetic field.

• When the north pole of the magnet enters either coil the current will be the same as the current produced by inserting the south pole of the magnet. This is because the current only depends on the presence of a magnetic field, not on the orientation of the field.

• When the north pole of the magnet enters either coil the current will be positive and when it exits the coils the current will be negative. This is because the current changes direction as the magnetic field changes.

Tags

NGSS.HS-PS2-5

What does the c stand for in the equation E=mc^2

• Energy

• Mass

• Constant

• Speed of light

Mark learned about electrical circuits at school and wanted to build one at home. He used the circuit shown in the diagram. However, none of the lights were glowing. He discovered that the current did not flow due to a broken filament in one of the bulbs.

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You are asked to verify the statement “for a constant current, there is a direct relationship between voltage and resistance”. Which of the following calculations could you perform to complete this task?

• An initial resistance of 50 Ω allows a current of 2.6 A. When the resistance is doubled, the current is 2.6 A.

• An initial voltage of 25.0 V creates a current of 1.25 A. The voltage is decreased to 12.5 V to create a current of 0.625 A.

• An initial resistance of 30 Ω allows a current of 1.25 A to flow. When the resistance is doubled, the current is 0.625 A.

• An initial current of 2.6 A is created when 62.5 V occurs. The current is then doubled to 5.2 A and the voltage doubles to 125 V.

• Light bulb P because it is connected by a series connection

• Light bulb O because it is connected by a series connection

• Light bulb M because it is connected by a parallel connection.

• Light bulbs M and N because they are connected in parallel connections.

• Replace the nail with a pencil.

• Increase the number of coils of insulated wire

• Connect an on/off switch between the battery and the nail.

• Reverse the direction of the positive and negative poles of the battery.

• A. The spinning loop will not spin anymore.

• The speed of the spinning loop will increase.

• The spinning loop will be repelled by the magnet.

• The spinning loop will change the direction it spins

Tags

NGSS.MS-PS2-3