Lesson 9

• Nask
• Middelbare school
• havo, vwo
• Leerjaar 2

Demonstration

This lesson

• Demonstration
• recap quiz
  
• What is voltage?
• What is resistance?

Learning goals

• You can explain what resistance is in your own words.
  

• You can explain what voltage is in your own words.
  

• You can describe the difference between how current is measured and how voltage is measured.
  

• You can describe how voltage gets divided over series and parallel circuits.

An iPhone charger uses a current of 0.08 ampere when connected to a European socket. With this current it takes an iPhone 12, 2 hours and 8 minutes to go from 0% to 100%. How much coulomb flew through the wire in this time?

1. 576 C
2. 0.224 C
3. 614.5 C
4. 96000 C

A current of 0,6 A flows out of the battery. What is the current flowing through each lamp?

1. 0.2 A
2. 0.6 A
3. 0.3 A
4. 1.2A

A current of 0,6 A flows out of the battery. What is the current flowing through each lamp?

1. 0.2 A
2. 0.6 A
3. 0.3 A
4. 1.2A

Current out battery = current component 1 = current component 2 =....

Series circuits

Current out battery = current branch 1 + current branch 2 +....

Parallel circuits

Resistance & voltage

What is resistance?

Resistance is the opposition to current flow.

Resistance

Symbol: R

Unit: Ohm

 Symbol for Ohm: Ω

Resistance is the opposition to current flow.

Examples:

• Resistance = 5 Ohm
  
• R = 5 Ω
  

What is voltage?

Voltage is the difference in the amount of electrical energy between two points in a circuit.

(also known as potential difference)

Voltage

Symbol: V

Unit: Volt

 Symbol for Volt: V

Voltage (potential difference) is the difference in the amount of electrical energy between two points in a circuit.

Examples:

• Voltage = 5 volts
  
• V = 5 V
  

• What is the difference between how you connect an ammeter and a volt meter in a circuit?
  

• How does voltage get divided over series and paralel circuits?

• What is the difference between how you connect an ammeter and a volt meter in a circuit?

An ammeter gets connected in series while a volt meter gets connected parallel.

• How does voltage get divided over series and paralel circuits?
  

	Series	Parallel
Voltage	Gets divided over the components	The same at every circuit loop.

Homework

• Read 9.8 + 9.9
• Do the yellow block exercises of 9.8
• Do the yellow block exercises of 9.9

Learning goals

• You can explain what resistance is in your own words.
  

• You can explain what voltage is in your own words.
  

• You can describe the difference between how current is measured and how voltage is measured.
  

• You can describe how voltage gets divided over series and parallel circuits.