1. An electric current will always follow ____.

• the path of least resistance
• a path toward the north pole
• a path toward the south pole
• the path that leads through insulators

2. In a series circuit with three bulbs, adding another bulb will ____.

• make the nearest bulb brighter
• make some of the bulbs dimmer
• make all the bulbs brighter
• make all the bulbs dimmer

3. In a parallel circuit with three bulbs, ____.

• the bulbs must all be located on the same branch
• there is only one path for the current to take
• current from each bulb has its own path
• the overall resistance increases if a new branch is added

4. The charge on a proton is ____.

• negative, and the charge on an electron is positive
• positive, and the charge on an electron is negative
• the same as the charge on an electron
• can change according to the situation

5. A complete, unbroken path through which electric charges can flow is a (an) ____.

• electric circuit
• electrical resistance
• magnetic field line
• magnetic pole

6. Materials that allow the charges of an electric current to move freely through them are called ____.

• insulators
• conductors
• resistors
• magnets

7. An example of an insulator is ____.

• rubber
• copper
• silver
• iron

8. A device used to open and close an electric circuit is a (an) ____.

• light bulb
• energy source
• switch
• resistor

9. Magnetic poles that are alike ____.

• attract each other
• repel each other
• do not interact
• have the same shape

Tags

NGSS.MS-PS2-5

10. Magnetic poles that are unlike ____.

• attract each other
• repel each other
• do not interact
• point in the same direction