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