AKS 10 - Electricity and Magnetism

AKS 10

Electricity and Magnetism

AKS 10

•  use mathematical and computational thinking to support a claim regarding relationships among voltage, current, and resistance

• develop and use models to illustrate and explain the conventional flow (direct and alternating) of current and the flow of electrons in simple series and parallel circuits

• plan and carry out investigations using motors, generators, and electromagnets to determine the relationship between magnetism and the movement of electrical charge

Ohm's Triangle

V = Voltage

I = Current

R = Resistance

Multiple Choice

Describe how the amount of voltage applied to a circuit affects current flow.

• Current and voltage of a circuit are indirectly related.

• Decreasing the voltage applied will increase the current flow.

• Increasing the voltage will increase the current proportionately.

• The voltage decreases the total charge passing through the circuit.

Multiple Choice

Describe how resistance affects the flow of current in a circuit.

• Efficiency of a circuit is dependent on decreasing the resistivity of the material.

• Current in the circuit increases with increasing of the innate resistivity of the material.

• Flow of electrons within the wire is increased by reducing the resistance by using a longer wire.

• The flow of current in a circuit is reduced by resistance from collisions of the electrons within the wire.

Multiple Choice

A Charging system producing 14.5 Volts with a current flow of 43.5 Amps, what is the circuit resistance

• 58 Amps

• 13 Amps

• 0.33 Amps

• 1 Amp

Multiple Choice

What size resistor would produce a 3 Amp current flow with a 12 Volt battery

• 1 Ohm

• 4 Ohms

• 3 Ohms

• 12 Ohms

Multiple Choice

What is Resistance?

• Electric potential difference

• The flow of electrons

• The ability to reduce the flow of electrons

• A battery

Multiple Choice

A resistor is placed in a circuit. The voltage of the circuit is changed and the current is measured. The graph seen here shows the data that was collected. Determine the resistance of the resistor in this circuit.

• 0.5 Ohms

• 1 Ohm

• 2 Ohm

• 3 Ohm

Multiple Choice

Compared to a parallel circuit, a series circuit has which of the following disadvantages?

• A series circuit requires more material to build than a parallel circuit.

• The entire circuit will not work if the circuit is open at any point.

• There is a limit to the number of components that can be added in a series.

• The current decreases as it passes through each successive component.

Multiple Choice

The diagram provided shows a circuit with three light bulbs. All three bulbs are illuminated.

Bulb 2 will continue to be illuminated if cuts are made in all of the locations on the wire indicated by the letters EXCEPT–

• A

• B

• C

• D

Multiple Choice

A diagram of a parallel circuit is provided below.

The current passing through each resistor depends on which of the following?

• How close the resistor is to the battery

• The number of resistors in the circuit

• The resistance of each resistor

• The length of wire connecting the resistor to the battery

Multiple Choice

Several light bulbs are wired in a circuit to the same power source. If one bulb burns out, the other will continue to remain lighted if which of the following is true?

• The power source is of sufficient strength.

• The bulbs are arranged in a parallel circuit.

• The distance between each bulb is small.

• The wire that connects the bulbs is insulated.

Multiple Choice

The same battery and bulbs are wired in two different ways in two different circuits, as shown in the illustration. What will be one difference in the circuits?

• The battery will lose power more quickly in Circuit 2.

• More wire will be required to make Circuit 1.

• The bulbs will shine more brightly in Circuit 2.

• The wires will get much hotter in Circuit 1.

Multiple Choice

The same battery and bulbs are wired in two different ways in two different circuits, as shown in the illustration. What will be one difference in the circuits?

• The battery will lose power more quickly in Circuit 2.

• More wire will be required to make Circuit 1.

• The bulbs will shine more brightly in Circuit 2.

• The wires will get much hotter in Circuit 1.

Multiple Choice

Renaldo and Nasreen build an electromagnet by wrapping a wire (copper - metal) around a nail and connecting the wire to both terminals of a battery. When they test the electromagnet, it can pick up 6 paper clips. Their teacher wants all groups to pick up at least 10 paper clips. What revisions could Renaldo and Nasreen make to increase the number of paper clips their electromagnet picks up?

• make the wire longer

• remove the nail from the center of the wire

• increase the number of loops of wire around the nail

• spread the loops of wire apart on the nail so they do not touch

Multiple Choice

An electromagnet is created using a battery, an insulated copper wire and an iron nail. The wire is wrapped around the nail 20 times and attached to the battery. Which pair of changes will definitely increase the strength of the electromagnet?

• Increase the voltage of the battery and decrease the number of turns of the coil.

• Decrease the voltage of the battery and decrease the number of turns of the coil.

• Increase the voltage of the battery and increase the number of turns of the coil.

• Decrease the voltage of the battery and increase the number of turns of the coil.

Multiple Choice

Why might an electromagnet be used to pick up old cars in junkyards?

• Electromagnets are inexpensive and easily create revenue.

• Electromagnets are powerful and can be turned on and off easily.

• Electromagnets are easy to operate and can be run by cheap labor.

• Electromagnets are versatile and can pick up any metallic objects in the yard.