6.2 & 6.3 Elek. deel 1 - Electrical circuits

• Natuurkunde / Scheikunde
• Middelbare school
• vmbo b, k, t, havo, vwo
• Leerjaar 1-3

Regels van orde

1e keer:  Waarschuwing --> Maximaal 3 namen op het bord

2e keer: Kleine schrijfopdracht op de gang

3e keer: Eruit, naar Loket 21

Nooit! 

Geluid uit telefoons / Oordopjes in 
Gooien
Eten/drinken 

Mutsen op / Jassen aan / Tassen op tafel  

Please get your stuff:

Start electricity

• Quiz about last week
  
• Make some exercises
• Questions on homework?
• Explanation parallel en serial circuits
• Formative questions

Learning objectives

• In a circuit you can distinguish between the concepts of            Current, Voltage and Charge. 
  
  
• You can tell the difference between a parallel circuit and a series circuit.

What is shown in this
circuit?

1. Nothing, because there is no current flowing.
2. A resistor, a battery and a switch.
3. A lamp, a battery and a switch.
4. A resistor, a lamp, a battery and a switch.

Why must a circuit be
closed in order to have
a current flowing?

1. It doesn't!
2. Otherwise charge can't return to the voltage source.
3. Otherwise charges will congest and heap up.
4. A hole in the circuit stops the flow, like water in a closed off hose.

What is electrical current?

1. It is the same as voltage.
2. It is the same as energy.
3. It is the same as charge.
4. It is flow of charge, which is expressed as charges per second.

What does the voltage
or power source do?

1. It pushes the charges around, which makes the current.
2. It produces energy.
3. It produces charges.
4. It produces voltage, and causes the current.

If you close the switch,
how will the current flow?

1. Just through the lamp.
2. Only from battery to lamp.
3. All around the circuit, from + pole of the battery to the - pole.
4. All around the circuit, from - pole of the battery to the + pole.

What's going wrong in
this circuit?

1. The current will get too high.
2. It doesn't work, because there is no lamp or similar device.
3. It is a short circuit!
4. Nothing goes wrong.

Circuits: Quiz Questions!

Current

Charge

Voltage

Closing the circuit

Good conductor

Good insulator

Always a loop?

Making a few excercises

Try it yourself, and feel free to quietly consult your neighbour.

Do exercises
 20, 21, 22, 23 page 178

(rest is homework)

Questions about the homework,
or exercises from just now?

Homework was: Read page 170 - 172

Do exercises 1, 5, 6, 7, 10, 14 

and  'just now':  20, 21, 22, 23 page 178

Phet

1 lamp	?current?
2 lamps series	?current?
2 lamps parallel	?current?
1 battery	?current?
2 batteries series	?current?
2 batteries parallel	?current?

Burning a fuse

Reading & Making excercises

Try it yourself, and feel free to quietly consult your neighbour.

Read page 180 - 182

Do exercises
 30, 31, 32, 34

= homework for next week Thursday

Exchange:
The following person may explain:

V5

V2

Wrong text in book!  Cross out:

"The voltage of the power source determines how much energy the power source can deliver."  blz. 185,  end of middle paragraph

"Therefore , a socket can deliver more energy than a battery."

blz. 185, top of bottom paragraph

"The greater the voltage of the power source, the more energy the power source can deliver."  blz. 186, Summary