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# find the voltage and current between point A and B?

1. What is the open circuit voltage between Points A and B?

2. If Points A and B are now connected together, what current would flow between them?

### 2 Answers

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- billrussell42Lv 72 months agoFavourite answer
use voltage divider formula

Va = 10.3(18)/(18+4.7) = 8.96 v

Vb = 10.3(0.82)/(0.82+6.8) = 1.11 v

Va–Vb = 7.85 v

connected together, first make each pair into thev. equivalent

left: R12 = 4.7•18/(18+4.7) = 3.73 kΩ

V = Va = 8.96 v

right: R34 = (0.82•6.8)/(0.82+6.8) = 0.73 kΩ

V = Vb = 1.11 v

when connected you have a voltage of Va–Vb and resistance of

R12+R34

and I = E/R = (Va–Vb) / (R12+R34) = 7.85/4.46 = 1.76 mA

- oubaasLv 72 months ago
1)

Va = 10.3*18/(18+4.7) = 8.17 V

Vb = 10.3*8.2/(8.2+6.8) = 5.63 V

Vab = 8.17-5.63 = 2.54 V

2)

Vab = 0

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