Atoms & Electricity Study Guide

An atom is:

• a large molecule

• the smallest building block of matter

• a type of chemical reaction

• a form of energy

Atomic number is the number of __________ OR __________ in an element’s atoms.

• Protons and Neutrons

• Protons and Electrons

• Neutrons and Electrons

• Protons only

Electricity is created by the movement of what kind of particles?

• Protons

• Neutrons

• Electrons

• Photons

What are the 3 variables involved in Ohm’s Law and what unit goes with each variable?

• Voltage (Volts), Current (Amperes), Resistance (Ohms)

• Power (Watts), Energy (Joules), Time (Seconds)

• Force (Newtons), Mass (Kilograms), Acceleration (m/s²)

• Pressure (Pascals), Volume (Liters), Temperature (Kelvin)

A small motor in a toy car pulls 2 A of current when running. If the motor has a resistance of 3 Ω, what is the voltage being supplied by the battery?

• 2 V

• 3 V

• 5 V

• 6 V

What does it mean when two charges attract?

• It means they will come together because they have the same type of charge.

• It means they will come together because they have opposite types of charge.

• It means they are neutral.

• It means they will go away from each other because they are both positive.

What does it mean when two charges repel?

• It means the charges are of the same type, either both positive or both negative. They will not come together.

• It means the charges are of opposite types, one positive and one negative. They will come together.

• It means the charges are neutral.

• It means the charges are in motion.

Coulomb’s law states that as charge increases, then force will _________________

• increase
• decrease

Coulomb’s law states that as charge decreases, then force will _________________.

• decrease
• increase

Coulomb’s law states that as distance increases (they get further apart), then force will _________________.

• decrease
• increase