Strength of Electromagnetic and Electric Fields

Unit 4
Review

Electricity & Magnetism

4.7 Series & Parallel Circuits

4.9 Fruit Battery Lab

4.10 Magnetism Basics

4.11 Earth's Magnetic Fields

4.12 Electromagnetism

4.13 Motors and Generators

4.1 Electric Charge

4.2 Electrostatics

4.3 Electrostatic Induction

4.4 Electric Fields

4.5 Circuit Basics

4.6 Voltage, Current, Resistance

What is in Unit 4?

Electric Force

Part 1

​DIRECTION OF ENERGY FLOW

​AWAY

​TOWARDS

​WEAK CHARGE
(FEWER LINES)

​STRONG CHARGE (LOTS OF LINES)

​# OF LINES = THE STRENGTH
OF CHARGE..

Categorize

Options (8)

closes a gap in a circuit

Paper clip

coin

doesn't close a gap in a circuit

dollar bill

eraser

Nothing goes here

Its gotta be somethin

Conductors vs Insulators

Both

Insulators

Conductors

Neither

Labelling

Label these charges

Drag labels to their correct position on the image

Stronger

Weaker

Positive

Attract

Negative

Repel

​The strength of the Electric Force

Open Ended

Write 2 facts about the strength of the electric force

Multiple Choice

The stronger the charge the stronger the electric field

• True

• False

Multiple Choice

Electric fields are stronger the farther apart they are located.

• True

• False

Multiple Choice

If a neutral object loses electrons what will the charges look like?

• • + + +

• • - - -

• + - + - + -

• +++---

Multiple Choice

If a neutral object gains electrons what will the charges look like?

• • + + +

• • - - -

• + - + - + -

• +++---

Dropdown

​ If a neutral object + - + - + -

lost electrons on the right side and gained electrons on the left side

what would the object’s electrical charge distribution look like?

(left)​

Select answer

​​(right)

Select answer

​

​

When a charged object is brought near an electroscope the metal in the electroscope becomes:

1. ​Charged

2. The metal leaves now have the same charge and will repel each other.

3. When the charged object is removed, the metal becomes neutral again.

Electroscopes

​Play the video and observe what happens when a charged object is brought near an electroscope.

Labelling

What is electrostatic induction?

Drag labels to their correct position on the image

Both metal leaves have + charges

charged object (+)

Metal leaves have + and - charges

metal leaves attract

Metal leaves repel

Neutral object

Part 2 - Circuits

• more than 1 path for the electricity to travel

• If you break one bulb it does NOT disrupt the other.

Parallel Circuit

• Only one path or the electricity to travel

• If you break light NONE of the others will work.

​​Series Circuit

Multiple Choice

When you remove a bulb from a three bulb circuit, and the other two bulbs go off, then the bulbs must have been connected in __________.

• parallel
• series
• open
• closed

Categorize

Options (8)

One path

if one light is removed all lights stop working

more than one path

if one light is removed the others still work

dont use answer. 1

dont use answer 2

Series vs Parallel Circuits

Series Circuit

Parallel Circuit

Dont Use 1

Dont use 2

Multiple Choice

What will happen if one light bulb is removed from this circuit?

• The other bulbs will go out.
• The other bulbs will stay on
• The other bulbs will get dimmer.
• The battery will become stronger.

Multiple Choice

If you increases the voltage you increase the electrical current.

• True

• False

Multiple Choice

If you increase the Ω , the electrical current will increase

• True

• False

Part 3 - Magnetism

Categorize

Options (11)

The push

the difference in charge between + and -

V

The Squeeze

Ohms

The flow

Amps

Electrons passing through a point

AC (wall) & DC (battery)

dont use answer

Organize these options into the right categories

Voltage

Resistance

Current

dont use

​Magnetism Basics

​Magnetic field lines are invisible!

The earth is a giant magnet!

​

We can use a compass to find the magnetic north pole of the earth but not the geographic north cause our earth is tilted.

Earth's Magnetic Field

• Keeps us safe from Solar Winds
  - solar winds would destroy our Ozone, knock out electricity and cell service.

• Makes pretty Auroras

Multiple Choice

In magnetic materials, all of the ________ are pointing in the same direction.

• doors

• electrons

• domains

• orbits

Drag and Drop

In a compass, the north pole of a suspended bar magnet is attracted to the ​

Placeholder

​

Placeholder

of Earth.

Drag these tiles and drop them in the correct blank above

North

Magnetic Pole

South

Geographic Pole

Hotspot

If a magnet is broken in half, where would the south pole be located on the broken magnet?

Drag and Drop

Facts about magnets:

​

Placeholder

poles attract. Magnetic field arrows go ​

Placeholder

from the North Pole.​ Magnetic field lines ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

Opposite

Like

toward

can be seen

away

are invisible

Open Ended

The Earth’s magnetosphere protects us from what?

​

Part 4

Electromagnetic Induction - The process of creating an electrical current from magnetism.

Materials that have a magnetic field are Iron, Nickel, and cobalt. These are called Ferromagnets.

Magnets make Electricity!

​To make electricity you need Magnetic Flux
watch the video to see it happen!

• Uses electricity to create a magnet.

• Can be turned on and off

• The right hand rule tells you the direction of the current or magnetic field.

• Has real word applications:

  • Trains

  • Cranes that move metal

  • Generators

  • Anything with a motor

Electromagnetism

Your fingers are the magnetic field.

Your thumb points in the direction of the current.

The Right Hand Rule

Hotspot

What factors would increase the ElectroMagnetic Force (EMF)?

Multiple Choice

Moving electricity generates a

• Magnetic field

• Resistance

• Electric field

Multiple Choice

Using the right hand rule, A represents the direction of the

• current

• magnetic field

Multiple Choice

Using the right hand rule, B represents the direction of the

• current

• magnetic field

Multiple Choice

Using the right hand rule, what is the direction of the current?

• up

• down

• Left

• right

Multiple Choice

Using the right hand rule, if the current is flowing towards you then the magnetic fields will flow from...

• A to D to C to B and around

• A to B to C to D and around

• A to C to D to B and around

• A to C to B to D and around

MOTION!

What Else Makes Electricity?

​A Bike Dynamo

REnewable Energy Sources

• Wind

• Water

• Steam

​Turning wind & water

​Into electricity using
Mechanical Energy!

Open Ended

How can playing soccer help children do their homework at night?

Multiple Choice

Which of these can be used to convert mechanical energy to electrical energy?

• Power plant

• wind turbine

• hydroelectric dam

• dynamo on a bike

• all of the above

Multiple Choice

True or False:

A motor converts electrical energy to mechanical energy, uses electromagnetic induction, and has a wire inside of a magnet that turns a shaft

• True

• False