The indicator bulb marked with 6V and 0.3A can normally light up under 6V voltage, and the current passing through the bulb is 0.3A. If the bulb is connected to a certain circuit, the current passing through the bulb can reach 0.45a. How can the small bulb still light up normally on this circuit? (please explain through calculation)

The indicator bulb marked with 6V and 0.3A can normally light up under 6V voltage, and the current passing through the bulb is 0.3A. If the bulb is connected to a certain circuit, the current passing through the bulb can reach 0.45a. How can the small bulb still light up normally on this circuit? (please explain through calculation)

First, we can calculate the resistance of the bulb r = u / I = 20 Ω
When the bulb current is 0.45a, the voltage at both ends of the bulb is u '= i'r = 9V
Therefore, a resistor should be connected in series to share the voltage of U '- u = 3V. At this time, the voltage at both ends of the bulb is still 6V and the current is still 0.3A
R string = (U '- U) / I = 3 / 0.3 Ω = 10 Ω

Third grade volume 2 mathematics is difficult, oral arithmetic is difficult, it must be difficult

640÷80= 8
15×5=75
23×3= 69
12×2×5=120
480÷80= 6
16×5= 80
27×3= 81
90÷15= 6
48÷4= 12
640÷16= 40
39÷3= 13
24×20= 480
32×3= 96
48÷16= 3
12×8= 96
27×3= 81
56÷14= 4
24÷8= 3
14×2= 28
83－45= 38
560÷80= 7
96÷24= 4
40÷20= 2
40×30= 1200
37＋26= 63
76－39= 37
605＋59= 664
30×23= 690
12×8= 96
27＋32= 59
48＋27= 75
4500×20= 90000
73＋15 = 88
120×600 = 72000
200×360= 72000
6800×400= 2720000
280＋270= 450
4×2500= 10000
6000÷40= 150
5×1280= 6400
310－70= 220
400×14= 5600
470＋180= 650
1000÷25= 40
160×600= 96000
20×420= 8400
290×300= 87000
8100÷300= 27
7600÷200= 38
7600÷400= 19
680＋270= 950
980÷14= 70
4200÷30= 14
6×1300= 7800
1300×50=65000
200×48= 9600
930－660= 270
530＋280= 810
9200÷400= 23
840÷21= 40
180×500= 900000
8000÷500 = 16
1900÷20= 95
200×160= 32000
8700÷300= 29
300×330=99000
3×1400= 4200
7000÷14= 500
600÷12= 50
9600÷80= 12
140×300= 42000
8800÷40= 22
9600÷800= 12
750－290= 460
5×490= 2450
760×20= 15200
7500÷500= 15
370×200= 74000
650÷13= 50
8600－4200=4400
240×4=960
15×10=150
12×11=131
160×30=4800
220×40=8800
104×5=520
4500÷50=90
120×2=240
90÷30=3
270÷30=9
270×30=8100
84÷21=4
76 △ 9 = 8 and 4
66 △ 7 = 9 and 3
100－54=46
123＋15=138
360÷4=90
55÷5=11
32×6=192
7000÷70＝100
200÷40＝5
180÷30=6
240÷40=6
35×2=70
140×7=980

Help me with 600 mental arithmetic problems,
Don't make symbols that you don't understand

1.45+15×6= 135
2.250÷5×8=400
3.6×5÷2×4=60
4.30×3+8=98
5.400÷4+20×5= 200
6.10+12÷3+20=34
7.(80÷20+80)÷4=21
8.70+(100-10×5)=120
9.360÷40= 9
10.40×20= 800
11.80-25= 55
12.70+45=115
13.90×2= 180
14.16×6= 96
15.300×6= 1800
16.540÷9=60
17.30×20= 600
18.400÷4= 100
19.350-80= 270
20.160+70=230
21.18-64÷8= 10
22.42÷6+20=27
23.40-5×7= 5
24.80+60÷3=100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80=70
29.25×16= 400
30.120×25= 3000
31.36×11= 396
32.1025÷25=41
33.336+70= 406
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010=2010
37.12×50= 600
38.25×8= 200
39.23×11= 253
40.125÷25=5
41.4200-2200=2000
42.220+80= 300
43.20×8×5= 800
44.600-3×200=0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
48.2800÷40=70
49.98÷14 = 7
50.96÷24 = 4
51.56÷14 =4
52.65÷13 = 5
53.75÷15 = 5
54.120÷24 =5
55.200÷25 = 8
56.800÷16 = 50
57.840÷21 =40
58.560÷14 = 40
59.390÷13 = 30
60.600÷15 =40
61.72÷24 = 3
62.85÷17 = 5
63.90÷15 =6
64.96÷16 = 6
65.78÷26 = 4
66.51÷17 =3
67.80÷40 = 2
68.100÷20 = 5
69.100÷4 =25
70.240÷40 = 6
71.920÷4 = 230
72.300÷60=5
73.64÷2 = 32
74.64÷4 = 16
75.50÷5 =10
76.60÷8 = 7.5
77.96÷4 = 24
78.90÷6 =15
79.400+80 = 480
80.400-80 = 320
81.40×80 =3200
82.400÷80 = 5
83.48÷16 = 3
84.96÷24 =4
85.160×5= 800
86.4×250= 1000
87.0×518= 0
88.10×76= 760
89.36×10=360
90.15×6= 90
91.24×3= 72
92.5×18= 90
93.26×4= 74
94.7×15=105
95.32×30= 960
96.40×15= 600
97.60×12= 720
98.23×30= 690
99.30×50=1500
100.5×700=3500
1.3/7 × 49/9 - 4/3
2.8/9 × 15/36 + 1/27
3.12× 5/6 – 2/9 ×3
4.8× 5/4 + 1/4
5.6÷ 3/8 – 3/8 ÷6
6.4/7 × 5/9 + 3/7 × 5/9
7.5/2 -（ 3/2 + 4/5 ）
8.7/8 + （ 1/8 + 1/9 ）
9.9 × 5/6 + 5/6
10.3/4 × 8/9 - 1/3
11.7 × 5/49 + 3/14
12.6 ×（ 1/2 + 2/3 ）
13.8 × 4/5 + 8 × 11/5
14.31 × 5/6 – 5/6
15.9/7 - （ 2/7 – 10/21 ）
16.5/9 × 18 – 14 × 2/7
17.4/5 × 25/16 + 2/3 × 3/4
18.14 × 8/7 – 5/6 × 12/15
19.17/32 – 3/4 × 9/24
20.3 × 2/9 + 1/3
21.5/7 × 3/25 + 3/7
22.3/14 ×× 2/3 + 1/6
23.1/5 × 2/3 + 5/6
24.9/22 + 1/11 ÷ 1/2
25.5/3 × 11/5 + 4/3
26.45 × 2/3 + 1/3 × 15
27.7/19 + 12/19 × 5/6
28.1/4 + 3/4 ÷ 2/3
29.8/7 × 21/16 + 1/2
30.101 × 1/5 – 1/5 × 21
31.50＋160÷40
32.120-144÷18+35
33.347+45×2-4160÷52
34（58+37）÷（64-9×5）
35.95÷（64-45）
36.178-145÷5×6+42
37.812-700÷（9+31×11）
38.85+14×（14+208÷26）
39.（284+16）×（512-8208÷18）
40.120-36×4÷18+35
41.（58+37）÷（64-9×5）
42.(6.8-6.8×0.55)÷8.5
43.0.12× 4.8÷0.12×4.8
44.（3.2×1.5+2.5）÷1.6
45.6-1.6÷4= 5.38+7.85-5.37=
46.7.2÷0.8-1.2×5= 6-1.19×3-0.43=
47.6.5×（4.8-1.2×4）=
49.5.8×（3.87-0.13）+4.2×3.74
50.32.52-（6+9.728÷3.2）×2.5