1.
2 2B 0.5
3
4
1LED LED
LED
A LED 220V
BLED
CLED
D LED
2
A B C D
3
A B C D
4 abbcac Uab
2VUbc2VUac4V
A
B
C
D
5 4.5V 03V
20 1A L 2.5V 1.25W