Engineering Principles V11

Clive W. Humphris

DC VOLTAGE: Voltage Divider.  

A simple voltage divider circuit can be constructed as shown, using just two resistors connected across a voltage supply.

Current I will flow through R1 and R2 determined by their combined value. The lower voltage (Vout) across R2 is found by Ohm's Law I × R2.

Circuits connected to the Vout junction are referred to as the Load. Load current will flow through R1 in addition to R2 current and effectively pull down the voltage at this junction due to the increased voltage drop across R1.

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