# electrical homework help

I need to solve exercise 57. I need to determine the voltage between points A and B in diagrams (a) and (b).

What I think so far:

• The voltage on 10 ohm resistor is = 0.1A * 10Ω = 1V
• The current on 20 ohm resistor will probably be 0.1A too (I think, I'm not sure). In this case its voltage is 2V (0.1A * 20Ω)
• UAB = Upower-Ur1-Ur2 = 4.5V-2V-1V = 1.5 V

Is it correct?

• Remember that the current through two elements that are in series will always be the same. – Hearth Nov 6 '18 at 14:14
• Then the two current will be 0.1A, so the voltage on 20 ohm resistor will be 2V? – T.Balazs Nov 6 '18 at 14:17
• Indeed it will. – Hearth Nov 6 '18 at 14:18
• And the AB voltage is correct what i have written? What will change on the results if the current flows in the another direction (b circuit version) ? – T.Balazs Nov 6 '18 at 14:20