4.1.1 Elementary Charge

Presentation

•

Physics

•

10th - 12th Grade

•

Hard

•

NGSS

HS-PS2-4, HS-PS1-1, HS-PS3-5

Standards-aligned

David Bittinger

Used 5+ times

FREE Resource

7 Slides • 6 Questions

4.1.1 Elementary Charge

by David Bittinger

Atomic Structure

Protons: Positive Charge, DO NOT move within matter

Neutrons: No charge, neutral. DO NOT move within matter

Electrons: Negative Charge, orbit the nucleus

Open Ended

Based on the location of the sub-atomic particles, what pattern do you notice about the particles that are mobile (electron) and those that do not move within matter (protons, and neutrons)

Type response here

•charge: a fundamental property of matter

–measured in COULOMBS (C) or ELEMENTARY CHARGE (e)

•

•charge on an object is carried by particles

–Electron

•-1.6 x 10-19 coulombs

•-1e

–Proton

•+1.6 x 10-19 coulombs

•+1e

•

–

Jump over to slide 4 of the ppt

Charged Objects

Because objects can only gain or lose electrons, the only charges that are allowed are multiples of the ELEMENTARY CHARGE

Neutral plate: # protons = # electrons

Charged plate: # protons not equal to # electrons

Jump to slide 5 on ppt

Multiple Choice

Example 1: An object has three excess electrons. What is its "elementary charge" and what is its charge in coulombs?

-3e & 4.8E-19 C

3e & 4.8E-19 C

-3e & -4.8E-19 C

3e & -4.8E-19C

Fill in the Blanks

An object has 75 protons and 65 electrons. What is its elementary charge?

Type answer...

Law of Conservation of Charge

•The total amount of charge in a closed system remains constant – charge is not created or destroyed, it only moves from one object to another

•Charge “moves” as a result of ELECTRON movement ONLY!!!

Multiple Choice

A metal sphere with 2 excess electrons touches a neutral metal sphere and then taken away. What do you predict the charge on each sphere will be after they make contact?

-1.6E-19 C

1 e

-3.2E-19 C

-2 e

Multiple Choice

A metal sphere with 2 excess electrons touches a neutral metal sphere and then taken away. What is the total charge on both spheres combined after they come in contact?

-1.6E-19 C

-3.2E-19 C

1 e

2 e

Multiple Choice

The number of excess elementary charges on sphere A is

6.25E-25

6.4E-19

2.5E13

5.0E13

4.1.1 Elementary Charge

by David Bittinger

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