test2.year2.txt (1218B)
1 5) 2 the circit should work at night as, the ldr will dawf the other resistor 3 4 the circit will not work at day as the ldr is still 400 OHM's which is 5 higher than the 100 OHM resistor 6 7 because the bulb has a resistance of 100 OHM's it will not work as expected 8 9 this will cause the bulb to never be properly on as the resistance in the bulbs branch 10 will limit the voltage through it to be <100 OHM's and thus it wont get 6V over it 11 12 to fix this a voltage follower can be place between the bulb and the potential divider 13 to keep the impedances at the right locations 14 15 (see book for details) 16 6)a)i) in book 17 6)a)ii) in book 18 6)a)iii) when the switch is releases the voltage over the capacitor will be at 8.65 V 19 this will mean the led is on. 20 when it falls to 6V the capacitor will make the logic gate switch 3.34 seconds after the switch 21 is released, this will cause the not gate to switch and the led to be on 22 6)b)i) in book 23 6)b)ii) in book 24 25 7)a) in book 26 7)b)i) in book 27 7)b)ii) in book 28 7)b)iii) in book 29 7)b)iv) in book 30 7)b)v) in book 31 32 8)a) in book 33 8b) in book 34 8)c)i) because it has a higher input imedance 35 8)c)ii) in book 36 8)c)iii) in book 37 8)d)i) in book 38 8)d)ii) to smooth the signal of noise 39 8)d)iii) in book 40 8)d)e) in book