Y2_T2_LSN2.4

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

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• 8 min max practice quiz.
• 7 min max peer review and feedback.
• 5 min max write a reflection in your notebook:
• What mistakes did I make?
• Why were they mistakes?
• What can I do better next time?

TOPIC 2.4

Circuits

P. 78-87

§2.4 - Learning Goals:

P. 78-87

I can…:

• explain the basic components necessary for building a simple circuit.
• draw circuit diagrams by using the circuit symbols.
• explain the advantages and disadvantages of a series circuit.
• calculate the current or voltage at various points in a series circuit.
• explain the advantages and disadvantages of a parallel circuit
• calculate the current or voltage at various points in a parallel circuit
• use an ammeter or voltmeter to properly measure the current or voltage at a certain point in a circuit.

§2.4 - Key Words:

P. 78-87

• wire
• power source
• batteries
• switch
• lamp
• bell
• Volt meter
• Ammeter
• motor
• LED
• series circuit
• parallel circuit
• consumption

§2.4 - Circuits

§2.4 - Circuits

§ 2.4 - Circuits - Series

• All components are in the same loop, end to end.
• There is only one direction in which the current can flow.
• The same current throughout the entire circuit.
• The voltage is shared by all components within the circuit.

§2.4 Circuits - Series

Every am-meter will show the same value.

The voltage is shared by all components.

What happens to the voltage when there are more components in a series circuit?

1. every component gets the same voltage
2. one component gets all of the voltage
3. The voltage is shared by all components
4. this won't work

§ 2.4 - Circuits - Parallel

• Multiple loops or paths for the current to flow through.
• The current is divided over every pathway.
• The voltage is the same for all components.

§2.4 Circuits - Parallel

The voltage is the same for all components, 

the current is divided.

The current only divides equally if components are the same.

voltage is the same for all components

current is the same throughout circuit

Series

Parallel

Still works if one lamp is broken

If you connect batteries this way, you can add their voltages

§2.4  - Circuits - Measuring

• You can measure Current (A) with an am-meter.
• You can measure Voltage (V) with a voltmeter.
• You can measure both with a multimeter.

Am-meter

• Measuring current

• Current must run through the meter.
• The meter is WITHIN the circuit

(The amount of electrons pass through the wire every second, is the amps.)

The voltmeter is always connected parallel.

Voltmeter has no influence on the current though the component.

A voltmeter

1. must be parallel with the component
2. Must be in series with the component

What is the value
of this voltmeter?

1. 2,5 volt
2. 25 volt
3. 12,5 volt
4. 0 volt

Single loop circuit

conventional

current

Current from the positive terminal to the negative terminal

series circuit

Digital ammeter

Analog Ammeter

the battery has a voltage of 5 V
How much volt is there for a lamp?

1. 2.5 V
2. 10 V
3. 5 V
4. 0 V

There is a current of 5 amps going at point A
How much current runs through each lamp?

A

1. 2.5 A
2. 10 A
3. 5 A
4. 0 A

Homework for next time:

Lablesson:

• Make sure you have collected all your data and are ready to use it in this lesson.
• You have completed your list of patterns with explanations.

Theory lesson:

• Complete the exercise of Topic 2.4 (p.74-77)
• Read Topic 2.4 (p. 78-81)
• Study the glossary of Topic 2.3 on Studygo.
• LABJOURNAL: prepare for the experiment: Series vs parallel circuits

Circuits simulation part 2:

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