Question

i think you have to use excel and graph it for the last question

Table 2: two D-cells in series Circuit Flow Obstacle Product for Flow Obstacle Product through Presented the through Presented for the Network by Network of the by the Rhcostat of Bulbs Network Bulbs Rhcostat Rheostat (glow-cm) (glow) of Bulbs (glow-cm) (glow) (cm) (cm) 9 1 59.3 59.3 1 2 20.8 220.8 10 2 29.7 59.3 2 110.2 220.4 3 19.8 59.3 3 70.5 211.5 11 Table 3: three cells in series Circuit Flow Obstacle Product for Flow Obstacic Product through Presented the through Presented for the Network by Network of the by the Rheostat of Bulbs Network Bulbs Rheostat Rheostat (glow-cm) (glow) of Bulbs (glow-cm) (glow) (cm) (cm) 121 59.3 59.3 378.4 378.4 2 29.7 59.3 2 181.2 362.4 14 3 19.8 59.3 3 125.1 375.3

Answer 1

TABLE 1:

average pressure difference across the network of bulbs:

Pnb=(45+45+45+45)/4 = 45 glow*cm

average pressure difference across the rheostat:

Pnb=(113.6+111+96.9+109.6)/4 = 107.775 glow*cm

Sum of the averages, P = 45 + 107.775 = 152.775 glow*cm

TABLE 2:

average pressure difference across the network of bulbs:

Pnb=(59.3+59.3+59.3)/3 = 59.3 glow*cm

average pressure difference across the rheostat:

Pnb=(220.8+220.4+211.5)/3 = 217.567 glow*cm

Sum of the averages, P = 59.3 + 217.567 = 276.867 glow*cm

TABLE 3:

average pressure difference across the network of bulbs:

Pnb=(59.3+59.3+59.3)/3 = 59.3 glow*cm

average pressure difference across the rheostat:

Pnb=(378.4+362.4+375.4)/3 = 372.067 glow*cm

Sum of the averages, P = 59.3 + 372.067 = 431.367 glow*cm

TABLE NO.	SUM OF PRESSURE DIFFERENCES (glow*cm)
1	152.775
2	276.867
3	431.367

the graph i.e., the functional relation is a linear fit. the variable that varies linearly with the table number is the number of D-cells used in the experiment. table 1 uses one D-cell, table 2 uses 2 and table 3 uses 3 D-cells.