Question

Find the values of different voltages that can be obtained from a 12-V battery with the help of voltage divider circuit of Fig. 1.90.

Answer 1

R = R₁ + R₂ + R₃ = 4 + 3 + 1 = 8 Ω 

Drop across R₁ = 12 × 4/8 = 6 V 

∴ V_B = 12 − 6 = 6 V above ground 

Drop across R₂ = 12 × 3/8 = 4.5 V 

∴ V_C = V_B − 4.5 = 6 − 4.5 = 1.5 

Drop across R₃ = 12 × 1/8 = 1.5 V 

Different available load voltages are : 

(i) V_AB = V_A − V_B = 12 − 6 = 6 V 

(ii) V_AC = 12 − 1.5 = 10.5V 

(iii) V_AD = 12 V 

(iv) V_BC = 6 − 1.5 = 4.5 V 

(v) V_CD = 1.5 V