8th Grade Review - Part 2

A student conducted an investigation to measure the flow of electric current. Which factor in each row of the data table would create the least resistance?

• Metal, Thick and Short Wire

• Metal, Thin and Long Wire

• Plastic, Thick and short Wire

• Plastic, Thin and Long Wire

• Metal, Thin and Short Wire

The flow of electrons through a circuit is called the __________ and is measured in __________.

• Current, Amps

• Voltage, Volts

• Resistance, Ohms

• Power, Watts

The potential difference in charge (or the pressure) between two points is called the __________ and is measured in __________.

• Voltage, Volts

• Current, Amperes

• Resistance, Ohms

• Power, Watts

Which of the following does NOT use an electrical motor?

• Blender

• Fan

• Wind Turbines

• Car

To increase the voltage in the circuit shown, a scientist could—

• use a resistor to add ohms

• replace the 1.5V battery with a 9V battery

• add a second load to open the flow of electrons in the current

• multiply the amps by cutting the resistance

You are working with your group on electrical conductivity. To light the bulb in the circuit, what material should be placed at Point A on the diagram shown?

• A copper penny

• A rubber band

• A plastic knife

• A glass rod

Tags

NGSS.MS-ETS1-1

What happens if the flow of electricity to an electromagnet is turned off?

• The magnetic field gets stronger

• The iron core is no longer magnetic

• A generator turns on to create mechanical energy

• The electromagnet will overheat

A student puts a comb and a balloon near each other. The objects attract. The student concludes that—

• both objects have negative charges

• one object has a positive charge and one object has a negative charge

• both objects have positive charges

• both objects are uncharged

Tags

NGSS.MS-PS2-3

In a circuit, electrons need to do all the following except—

• receive energy from a source

• form a complete and conductive path

• move around the circuit from high to low potential

• create new energy

Tags

NGSS.MS-PS3-5

If you were trying to amplify electrical signals in a stereo, which type of device would you use?

• Compass

• Transistor

• Generator

• Electroscope