6-2 Resistance (p 225)

Resistance (6.2 p 225)
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Slide 1: Diapositive
NatuurkundeMiddelbare schoolhavoLeerjaar 3

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Resistance (6.2 p 225)
Pen, pencil, iPad, writingbook, calculator
Phones in the phone bag
Schoolbags in the cupboard

Slide 1 - Diapositive

Lesson goals:
  • Make calculations with Ohms law.

Slide 2 - Diapositive

Differences in current...
All household appliances use a voltage of 230 V but still a kettle uses morge energy than for example a LED. The reason for this difference is resistance. 
A kettle has a higher resistance than a 
LED.

Slide 3 - Diapositive

Resistance of a conductor
The greater the resistance, the more difficult it is for the current to pass through the conductor.

Slide 4 - Diapositive

Formula:
R=IU
R - Resistance 
(ohm)

U - Voltage 
(Volt)

I - Current 
(Ampére)
Ω
V
A

Slide 5 - Diapositive

Slide 6 - Diapositive

What is the symbol for voltage?
A
C
B
Q
C
U
D
I

Slide 7 - Quiz

If the voltage is 230V and the current is 300mA, what is the resistance?
A
0,76 ohm
B
767 ohm
C
69 000 ohm
D
69 ohm

Slide 8 - Quiz

If the resistance is 5 ohm and the voltage is 2V, what is then the magnitude of the current?
A
2,5 A
B
0,4 A
C
10 A
D
0,01 A

Slide 9 - Quiz

What is the voltage across a resistance (0,3 ohm) if the current through the resistor is 250 mA?
A
75 V
B
0,075 V
C
833 V
D
0,83 V

Slide 10 - Quiz

question 15 (p 229)
timer
3:30

Slide 11 - Diapositive

Slide 12 - Diapositive

16 (p 229)
timer
6:00

Slide 13 - Diapositive

Slide 14 - Diapositive

17 (p 229)
timer
4:00

Slide 15 - Diapositive

Slide 16 - Diapositive

What did you
learn today?

Slide 17 - Carte mentale

Homework
Q 18 on p 230 (make the graph in your writingbook and the rest in the digital method)

Slide 18 - Diapositive

Conclusion:
  • Resistance - current passes through it with difficulty
  • Formula


R - Resistance in Ohm
U - Voltage in volt
I - Current in Ampére
R=IU

Slide 19 - Diapositive