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Lesson 4 — Current, voltage and ressistance
Electricity — 5.2 Resistance
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Slide 1:
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Physics
Middelbare school
vwo
Leerjaar 3
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Lesduur is:
45 min
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Electricity — 5.2 Resistance
Slide 1 - Tekstslide
This lesson
The planner
Discussing the homework
Voltage, current & resistance
Going over 5.2 Resistance
Slide 2 - Tekstslide
Slide 3 - Tekstslide
Discussing the homework
Slide 4 - Tekstslide
Exercise 2
Variable
Symbol
Unit
Symbol
voltage
I
Ohm
Slide 5 - Tekstslide
Exercise 2
Variable
Symbol
Unit
Symbol
voltage
U
Volt
v
Current
I
Ampere
A
Resistance
R
Ohm
Ω
Slide 6 - Tekstslide
Excercise
4
a) The current changed
b)
c) The wire heated up
d)
R
=
I
U
Slide 7 - Tekstslide
Excercise
4
a) The voltage remains constant, but the current changed over time. This can only be the case when the resistance of the filament changes.
b)
c) The wire inside of the incandescent bulb
heated up which caused the resistance to increase.
d)
R
=
I
U
Slide 8 - Tekstslide
Current
Voltage
Resistance
Slide 9 - Tekstslide
R
=
I
U
R
e
s
i
s
t
a
n
c
e
=
c
u
r
r
e
n
t
v
o
l
t
a
g
e
Slide 10 - Tekstslide
Current — The amount of charge that flows through a given point in a circuit per unit of time.
Voltage — The difference in electrical potential energy between two points in a circuit.
Resistance — The measure in which a circuit resists the flow of electrical current.
Slide 11 - Tekstslide
Slide 12 - Tekstslide
Going over 5.2
Resistance, voltage & current
Understand the concepts theoretically
Understand what they are in an electric circuit
Ohmic resistance
Resistance and temperature
Variable resistors
Slide 13 - Tekstslide
Homework
Read 5,2 Plus section
> 5.2 Exercise 10, 11
< 5.2 Exercise 10
Slide 14 - Tekstslide
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