2018 WAEC GCE PHYSICS PRACTICAL QUESTIONS AND ANSWERS

(3a)
R ohms
R1 = 1ohms R3 = 3ohms
R2 = 2ohms R4 = 4ohms
R5 = 5ohms
V1 = 1.90v
V2 = 2.15v
V3 = 2.3v
V4 = 2.40v
V5 = 2.5v

In a tabular form
Under S/N
1, 2, 3, 4, 5

Under R(ohms )
1.00, 2.00, 3.00, 4.00, 5.00

Under V(v)
1.90, 2.15, 2.30, 2.40, 2.50

Under R^-1(ohms^-1)
1.000, 5.000, 0.333, 0.250, 0.200

Under V^-1(V^-1)
0.5263, 0.465, 0.4347, 0.4167, 0.400

Under R^-1/V^-1
1.900, 1.07, 0.768, 0.5999, 0.500

(3avi)
(i) Ensure tight connections.
(ii) Avoid error due to parallax when reading the voltmeter

(3b)
(i) Length of wire
(ii) Nature of wire

(3bii)
Total resistance,
R = 3 + (3×3)/(3+3)
R = 4.5 ohms
Current, I = V/R
I = 6/4.5
I = 1.33 A 


Source: CodedExam

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