Grade 8 Electricity: post test

The accumulation or buildup of excess electric charges on an object

• static electricity

• grounding

• electron cloud

A(n) ______________________________ is an instrument used to detect the presence of an electric charge.

• scale

• van de graaff generator

• electroscope

In which picture(s) below will the charged objects attract?

• A and C

• B and D

• A and B

The girl's hair and the comb are attracting  one another.  The hair and the comb have

• opposite charges
• like charges

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

If the electroscope was charged positively, how does this remove the charge from the electroscope?

• Electrons move from the hand to the electroscope

• Protons move from the hand to the electroscope

• Electrons move from the electroscope to the hand

• Protons move from the electroscope to the hand

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Lightning occurs because ___. 

• the negative charges at the bottom of clouds are attracted to the positive charges on the ground.
• the positive charges at the bottom of clouds are attracted to the negative charges on the ground.
• the positive and negative charges inside clouds are attracted to each other
• All of these reasons are correct.

Tags

NGSS.MS-ESS2-5

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Why do lightning rods need to be grounded?

• They don't. The rod is enough to protect the home
• to create a path for the electricity to get to the ground
• to direct the electricity to the power grid of the house
• to deflect the electricity back into the cloud

Tags

NGSS.MS-ESS3-2

NGSS.MS-ETS1-3

The primary function of a fuse is to

• Open the circuit

• Protect the appliance

• Protect the line

• Prevent excessive currents from flow through the circuit

How much energy does a 100-W light bulb use in 8.0 hours?

• 0.0080 kWh

• 0.80 kWh

• 13 kWh

• 800 kWh

Electric energy is measured in

• kWh

• Amps

• Ohms

• Watts

Tags

NGSS.HS-PS3-5