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fireedwin fireedwin
wrote...
Posts: 39
Rep: 2 0
11 years ago
Maria is designing a voltage divider using a 30-V battery and a 375 ohms resistor as Rb. What resistor should be used as Ra if the output voltage across RB is to be a 22.5 V?
*Ra and Rb are both resistors
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wrote...
11 years ago
30V*Rb/(Ra+Rb) = 22.5V

Solve for Rb
wrote...
11 years ago
30 - 22.5 = 7.5V.
22.5/7.5 = 3:1.
375/3 = 125 ohms.
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