4.1 Making an electrical circuit

• Natuurkunde
• Middelbare school
• vwo
• Leerjaar 2

Book: NOVA 1/2A

Chapter 4: Electricity

Powerpoints: LessonUp (make account later)

Homework and info: SOM

Homework tasks: Malmberg website (Check)

4.1 Making an electrical circuit

What is actually flowing?

Electrons

• These are electrically charged particles
  
• they are very small
  

When there is lightning and with 

a plasma light, you can see the 

electrons.

Representation of the flow of an electric current.

Electricity is a flow of charge 

Which of the following is a good conductor of electricity?

1. Copper
2. Wood
3. Rubber
4. Glass

Copper

Copper is a metal.

Metals are conductors.

Which material is an insulator?

1. Brass
2. Aluminum
3. Iron
4. Plastic

Plastic

Electrical wires are wrapped by plastic so you don't get shocked. 

The inside is made of copper

Build your own circuit

Open circuit

Closed circuit

Measuring electrical current

The unit of the electrical current is ampère (A)

Prefixes: milli, kilo, etc

The unit for current is ampère, but often we talk about mA (milliampere). 

Let's see in the next couple of questions if you can still convert the prefixes. 

What is 5 kilograms in grams?

1. 50 grams
2. 50000 grams
3. 5000 grams
4. 500 grams

What is 2 milliliters in liters?

1. 0.02 liters
2. 0.002 liters
3. 0.2 liters
4. 2 liters

What is 3000 millimeters in decimeters?

1. 30 dm
2. 300 dm
3. 0.3 dm
4. 3 dm

What is 200 mA in A?

1. 20 A
2. 0,02 A
3. 2000 A
4. 0,2 A

Let's check

What is the purpose of a closed circuit?

1. To generate static electricity
2. To allow the flow of electric current
3. To block the flow of electric current
4. To store electrical energy

What is the unit of electrical current?

1. Ohm (Ω)
2. Watt (W)
3. Volt (V)
4. Ampère (A)

Why are electrical wires wrapped in plastic?

1. To prevent electric shock
2. To increase conductivity
3. To reduce resistance
4. To enhance insulation

Experiment 1

Insulator or Conductor

Build a simple circuit with a light in it.

Leave the circuit OPEN

Test the materials.

When will the conclusion be that the material is a conductor?

In class and Homework

In class:

Read Chapter 4.1; Making an electric circuit

Make a list with difficult words

Describe the meaning of these words

Homework: See SOM next lesson (monday)