2018/19 PRIVATE WASSCE (WAEC GCE) CONFIRMED PHYSICS PRACTICAL QUESTIONS AND ANSWERS BY COOLBOY FOR GHANA....SIERRA LEONE....GAMBIA AND NIGERIA

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(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