In connection with Ohm's Law, the students have already learned
that pure metallic conductors have a resistance which increases
with increasing temperature.
PTC resistors (Positive
Temperature Coefficient) behave
the same way in a certain temperature range. Both of these
experiments are used to prove this.
The first experiment does not just serve as an introduction to this
topic. It is also useful for demonstrating the terms self-heating
(in the first experiment) and external heating (in the second
experiment). The second experiment is useful in confirming these
concepts.
Determine the resistance values for a PTC resistor with various
currents and at various temperatures.
| Materiallist (Excerpt) |
Product |
Amount |
|
Power supply 0...12 V DC/ 6 V, 12 V AC, 230 V
|
13505-93
|
1
|
|
Multi-range meter, analogue
|
07028-01
|
2
|
|
Socket module for incandescent lamp E10, SB
|
05604-00
|
1
|
|
Interrupted connector module, SB
|
05601-04
|
2
|
|
Angled connector module with socket, SB
|
05601-12
|
2
|
|
PTC-resistor module, SB
|
05631-00
|
1
|
|
Straight connector module, SB
|
05601-01
|
1
|
|
Angled connector module, SB
|
05601-02
|
2
|
|
Filament lamps 4V/0.04A, E10, 10
|
06154-03
|
1
|
|
Connecting cord, 32 A, 500 mm, red
|
07361-01
|
2
|
|
Connecting cord, 32 A, 500 mm, blue
|
07361-04
|
2
|
|
Connecting cord, 32 A, 250 mm, red
|
07360-01
|
1
|
|
Connecting cord, 32 A, 250 mm, blue
|
07360-04
|
1
|
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