Unit 2 Exam - Electricity and Magnetism

If an atom has 5 protons, 5 neutrons and 3 electrons, what is the atom's charge?

• +2

• -2

• 0

• -3

An atom that has a negative four (-4) charge will have which of the following?

• 4 more protons than electrons

• An equal amount of protons and electrons

• 4 more electrons than protons

• 2 more neutrons than protons

Which law states that a charge cannot be created or destroyed?

• Law of Conservation of Charge

• Law of Conservation of Motion

• Ohm's Law

• Law of Conservation of Energy

Which of the following is an example of a material whose atoms strongly hold on to electrons?

• Conductor

• Neutral

• Insulator

• A charging material

Which of the following is an example of a material that allows electrons to easily move through it?

• Conductor

• Neutral

• Insulator

• A charging material

When the plastic coating around a cord is damaged, why does the cord become hazardous?

• The damaged cord looks bad

• The damaged coating exposes the wires and can electrocute someone

• The damaged cord can break off and the device will not work

• The damaged cord can cause it to bond to something else

Which of the following explains how electrical charges flow?

• From areas of high-potential to areas of low-potential

• From areas of low-potential to areas of high-potential

• Electrical charges do not flow

• From the detector to the source

What unit is used when measuring the push that causes a charge to move?

• Ohm

• Volts

• Resistance

• Pressure

What creates the charge in an electrical current?

• electrons

• protons

• neutron

• protons and neutrons

What is the SI unit amperes used to measure?

• Resistance

• Ohms

• Voltage

• Electrical Current