TTO1 - chapter 7 - Electricity

• Science
• Middelbare school
• vwo
• Leerjaar 1

What is the most specific feedback you gave yourself?

Electricity
What do think of?

Electricity
What are you curious about?

How is this experiment possible?
Write down keywords

Which questions have you got about the homework? Mention page and question number.

What is static electricity?

Which particles are responsible for
(static) electricity?

What are the characteristics of these electrons?

Characteristics electrons

Negatively charged

Loosely bound

On the outside of the atom

A particle (atom) has 10 protons, 10 neutrons and 10 electrons.
What is the overall charge?

1. 0
2. 10
3. 20
4. 30

A particle (ion) has 9 protons, 10 neutrons and 10 electrons.
What is the overall charge?

1. 0
2. -1
3. +1
4. +2

Another particle (ion) has 11 protons, 12 neutrons and 10 electrons.
What is the overall charge?

1. 0
2. -1
3. +1
4. +2

Particles and charge

A particle (atom) has 10 protons, 10 neutrons and 10 electrons --> Ne

A particle (ion) has 9 protons, 10 neutrons and 11 electrons. --> F-
A particle (ion) has 11 protons, 12 neutrons and 10 electrons. --> Na+

NB! Write the - and + at the top just like in maths.

rubbing

What action is important to create static electricity?

Conductors

Insulators

Give examples of where static electricity occurs.

Static electricity occurs

1. polyethene (plastic) rods rubbed with a woolen cloth
2. rubbing something with a dry duster
3. pulling off a woollen or synthetic jersey
4. jumping on the trampoline
5. sliding of the plastic slide
6. Van de Graaff generator
7. electric equipment with moving parts, eg. fan (ventilator) of a computer
8. brushing your hair with a plastic comb or brush
9. lighting = discharge of staticly charged clouds 

What is static electricity?

Van de Graaff generator

https://www.youtube.com/watch?v=rNEY3Yv9kC8

Today

1. Lightning - recap static electricity + danger

2. Generation of electricity - how is it made

3. Batteries

4. How is electricity used in different devices.

5. Resistancy + calculations

Next lesson = last lesson!!!

Answers

- two insulating* objects, eg. large clouds with ice crystals

- rubbing movement

- electrons jumping from one object to the other

- charge = energy carried by an electron

* insulators are needed to make sure the electrons stay on the objects and don't escape

What is needed for static electricity?

Needed for static electricity

•  two insulating* objects, eg. large clouds with ice crystals
• rubbing movement
• electrons jumping from one object to the other
• charge = energy carried by an electron

* insulators are needed to make sure
the electrons stay on the objects
and don't escape

Movement

Coil of metal wire

Magnet

Axle

What is needed to generate electricity?

Types of Energy Sources

Wind, sun, food, biomass

Water: hydroelectricity, waves, tides

Fossil fuels (gas, oil, coal, petrol), nuclear

Green

Blue

Grey

Renewable

Non-Renewable

Batteries

Go and take a look at the first battery on page 9.

What energy change occurs in a battery?

1. movement --> electric
2. potential --> electrical
3. chemical --> electric
4. chemical --> potential

How does a battery work?

Two metals react such as zinc and silver

releasing electrons.

Wet cloth functions as electrolyte = 
liquid passing through the electrons

Zn(s)→Zn​2+​​(aq)+2e​−​​

Ag​+​​+e​−​​→Ag(s)

Discovery Education Video

Invention of the battery

Electric push = voltage

Battery provides chemical energy to push round the current in the circuit.

What is the current?

What is electric current?

Electric current = flow of e-

Flow of electric charges = electrons (page 85).

Electric circuit is needed = path along which electricity can flow (p. 87).

For the current to flow the circuit needs to be complete = a circuit with no gaps.

What happens in each part of the circuit starting from the battery?

Discuss in pairs.

After: random turns

How is electricity used in different devices?

- Light bulb

- LED light (Light Emitting Diode)

- Taser

Today

You choose out of the following activities:

1. Using the learning objectives > study planner > Magister verify if you grasp all the test matter. Ask specific questions. Science lab?

2. Discuss content questions from phet assignment with teacher. Come to front.

3. I had technical difficulties with the phet assignment. I'm going to check my email in order to resolve them.

4. Discuss calculations about resistance with the teacher.

5. Continue working on the BONUS material from the book or the calculations workheet.

I'm going to do the following:
Raise your hand if you choose option 5.

1. Learning objectives with study planner
2. teacher explanation phet assignment (content)
3. teacher explanation calculations
4. Resolve technical difficulties