Cocrodile Practices for your computer in pdf

CROCODILE PRACTICES. 3rd ESO. IES MARÍA ZAMBRANO. TECHNOLOGY DEPARTMENT
Explain the working of these circuits, with your own words. First, do them with the software.
UPUD: Interruptor Un Polo Una Dirección
UPDD: Interruptor Un Polo Dos Direcciones
DPDD: Interruptor Dos Polos Una Dirección
DPDD: Interruptor Dos Polos Dos Direcciones
NA:
Pulsador
Normalmente
Abierto
NC:
cerrado
Pulsador
Normalmente
CROCODILE PRACTICES. 3rd ESO. IES MARÍA ZAMBRANO. TECHNOLOGY DEPARTMENT
DIODES
1.
In the following circuit, try to insert 4 LEDS; but we have to do that only the LEDS in the positions L1 and L4 finally
light.
a)
What does happen if we change the battery into another one with 9 V?
b) What does happen if, now, we decrease the resistance value to 100?
c)
What does happen if, now, we decrease the resistance value to 400?
CROCODILE PRACTICES. 3rd ESO. IES MARÍA ZAMBRANO. TECHNOLOGY DEPARTMENT
VARIABLE RESISTORS
Circuit A
This circuit contains a variable resistor
1. What does happen if we increase the value of the resistor to 400?
2. How much is the value of the current now?
3.- What does happen if we decrease the value of the resistor to 100?
4.- How much is the value of the current now?
5. What is your conclusion?
Circuito B
This circuit contains a light dependent resistor (LDR)
6.- What does happen is we increase the light over the resistor? Which is
the value of the resistor in this case?
7.- How much is the value of the current now?
8.- What does happen is we decrease the light over the resistor? Which is
the value of the resistor in this case??
9.- How much is the value of the current now?
10. What is your conclusion?
Circuito C
This circuit contains a temperature dependent resistor, termistor –t or NTC
11.- What does happen is we increase the temperature over the resistor?
Which is the value of the resistor in this case?
12.- How much is the value of the current now?
13.- What does happen is we increase the temperature over the resistor?
Which is the value of the resistor in this case?
14.- How much is the value of the current now?
15 What is your conclusion?
CROCODILE PRACTICES. 3rd ESO. IES MARÍA ZAMBRANO. TECHNOLOGY DEPARTMENT
Try to think what would be the electrical scheme, simulate in Crocodile, and, when they work, draw them in
this table.
Circuit
A light bulb is working when
we push 2 push buttons at
the same time.
A light bulb is working when
we push any of the 2 push
buttons.
A switch makes work 2 series
light bulbs.
A switch makes work 2
parallel light bulbs.
Depending on the position of
the circuit switch, is working
one light bulb or another
one, when we have a parallel
circuit with 2 light bulbs.
Scheme