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6-3 Law of ohm (6.2 p 226)
Law of ohm (p 226)
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Natuurkunde
Middelbare school
havo
Leerjaar 3
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Law of ohm (p 226)
Stationary
- Writing book
- Pen, pencil
- Calcualtor
- iPad
Mark
- NO
Lessonup
- YES
Schoolbags
in
the cupboard
Phones
in the phone bag
Slide 1 - Diapositive
Lesson goals:
Give ohms law in words and
in a formula
.
Draw graphs showing conductors adhering to ohms law and conductors that dont adhere to ohms law.
Explain what an NTC and LDR is
And then you will do a practical where you draw graphs of a lightbulb and a resistor.
Slide 2 - Diapositive
Ohm's law
The voltage across a conductor and the current through a conductor are directly proportional if the resistance remains constant.
Slide 3 - Diapositive
Direct proportionality
As one amount increases, the other
amount increases at the same rate.
Slide 4 - Diapositive
https:
Slide 5 - Lien
What is the relationship between voltage and current?
A
Linear relationship
B
Directly proportional
C
Inversely proportional
D
Proportional relationship
Slide 6 - Quiz
What is the relationship between the current and the resistance?
A
Linear relationship
B
Directly proportional
C
Inversely proportional
D
Proportional
Slide 7 - Quiz
What is the unit for voltage?
A
Ampere
B
Volt
C
Ohm
D
Kilogram
Slide 8 - Quiz
The resistance in a circuit remains constant. At a voltage of 1,7 V the current is 3,5 A. What is then the current at a voltage of 5,1 V?
A
1,2 A
B
2,5 A
C
8,3 A
D
10.5 A
Slide 9 - Quiz
The resistance in a circuit remains constant. At a voltage of 1,7 V the current is 3,5 A. What is then the voltage at a current of 5,6 A?
A
1,1 V
B
2,7 V
C
2,9 V
D
3,2 V
Slide 10 - Quiz
Explain what a direct proportionality is.
Slide 11 - Question ouverte
NTC - negative temperature coefficient
An NTC is sensitive to changes in temperature. If the temperature rises the resistance decreases.
Uses: prevents overheating in electronic
appliances like computers and
amplifiers.
Slide 12 - Diapositive
LDR - Light dependent resistor
Sensitive to changes in light. More light results in less resistance.
Uses: As a switch in a nightlamp
Slide 13 - Diapositive
An NTC is sensitive to changes in
A
temperature
B
light
C
current
D
voltage
Slide 14 - Quiz
Now do experiment 2 and 3 (p247 and 248)
Rules:
- Work in groups of 2 or 3
- It is not for a mark.
- Important to have the graph of U vs I
for the lightbulb and the resistor done
in 20 minutes.
timer
20:00
Slide 15 - Diapositive
Resistance and temperature
With an incandescent lightbulb
there is a deviation from the
direct proportionality.
The reason is the high temperature of
the filament. The higher the temperature
the greater the resistance.
Slide 16 - Diapositive
What did you
learn today?
Slide 17 - Carte mentale
Homework
Test yourself 6.2
Slide 18 - Diapositive
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