Class 2 - Chapter 4 Electricity

• Natuurkunde / Scheikunde
• Middelbare school
• vwo
• Leerjaar 2

Chapter 4 - Electricity

recap after the holiday

Today

- Live les + Lessonup

- Recap of paragraph 1 till 4

- On your own, make the D-test  (online)

How well do you remember all the explanations? Rate yourself:

1. 4
2. 6
3. 8
4. 10

What is the title of
the chapter?

A closed circuit
consists of which 3 parts?

A lamp uses:

1. Electrical current
2. Electrical energy
3. Electrical voltage
4. Electrical resistance

Which three substances are resistors?

1. Rubber, plastic and glas
2. Plastic, diamond and wood
3. Rubber, oil and wood
4. Plastic, oil and glass

Which substance is a conductor?

1. All metals
2. Carbon
3. (Sea)water
4. Lemonjuice

Electrical current tells you something about?

1. How many particles 'flow' past
2. How 'fast' the particle is going
3. How much electrical energy a particle 'carries'
4. How 'energetic' a particle is

Electrical voltage tells you something about?

1. How many particles 'flow' past
2. How 'fast' the particle is going
3. How much electrical energy a particle 'carries'
4. How 'energetic' a particle is

How much voltage comes from an electrical outlet at home?

1. 2,3 volt
2. 23 volt
3. 230 volt
4. 2300 volt

If you connect 4 batteries of 1.5 volts in series, you get a total voltage of:

1. 5,5 volt
2. 6,0 volt
3. 2,66 volt
4. 2,5 volt

Wire

Battery

Light

Switch

Motor

Power outlet

In a series circuit, the ... is the same everywhere.

1. Current
2. Voltage
3. Energy
4. Power

In a parallel circuit, the ... is the same everywhere.

1. Current
2. Voltage
3. Energy
4. Power

To calculate the power you need the following two data:

The correct formula to calculate the power is:

1. voltage+current
2. voltage−current
3. voltage⋅current
4. ​voltage​​current​​

The correct formula is:

1. P=U+I
2. P=U−I
3. P=U⋅I
4. P=​U​​I​​

Quantity

Unit

Sybmbol

symbol

Power

Current

Voltage

P

I

V

Ampère

A

W

U

Watt

Volt

Last question!

Good luck!

How well did it go, what grade do you give yourself if you are honest?

1. 4
2. 6
3. 8
4. 10

TEST?

Wednesday test, online! Open book key.

Have a charged iPad and phone.

Log in from your phone to the Hangouts Meet, camera on.

The test comes via e-mail -> Google Forms.

Make the test on your iPads

What did you think of this way of repeating?

Give me (Mr. Post) 1 tip and 1 top:

Huiswerk

Diagnostic test

Magister -> Leermiddelen -> Nask -> Hoofdstuk 4

Deadline: Monday 4-Jan 9:00 pm (tonight)

And now?

2 options:

Option 1: independently take the D-test

Magister -> Leermiddelen -> Nask -> Hoofdstuk 4

Option 2: Hang on and follow the quick recap

Summary also comes via a link in Classroom.

Paragraph 1

• Circuit
• Electrical energy
• Insulating and conductive materials

• Current
  

Paragraaf 1

• Circuit

In this circuit, the battery is connected to the battery with two cables. We then speak of a closed circuit.

Paragraaf 1

• Electrical energy

When the light is on, it consumes electrical energy. This energy is provided by the battery.

Paragraaf 1

• Insulators and conductors

            Insulators                                         Conductors

Paragraaf 1

• Current
• Current (I) is measured in amperes (A).

Current = the amount of particles that flow through the wire in a specific place in a second

Paragraaf 2

•  Voltage

• Voltage sources
  
• Batteries in series connection
  
• Mains voltage (230 volts from the socket)
  

Paragraaf 2

• Voltage
• You measure voltage (U) in volts (V).

Voltage = the amount of electrical energy that the particle 'carries' with it

Paragraaf 2

• Voltage sources

Paragraaf 2

• Voltage sources

A small battery supplies about 1.5 volts

An electrical outlet supplies about 230 volts

An (electric) train runs on 1500 volts

Paragraaf 2

• Batteries in series connection

Often you need more than one battery to

to get the right tension.

You have to connect the batteries in series.

If you do this (correctly) you can add up the voltages.

Paragraaf 3

• Symbols

• Series connection
  
• Parallel connection
  

Paragraaf 3

• Symbols
  

Paragraaf 3

• Series connection
• In a series circuit, the amperage is the same everywhere.

Paragraaf 3

• Parallel connection
• In a parallel circuit, the voltage is the same everywhere.

Paragraaf 4

• Power

• Formula (                           )

P=U⋅I

Paragraaf 4

• Power
• You calculate power in watts

Power tells you how much electrical energy a device uses in 1 second

Paragraaf 4

• Formula

power=voltage × current

P=U⋅I

Quantity	symbol	Unit	symbol
power	P	watt	W
voltage	U	volt	V
current	I	ampere	A