Voltage Divider

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Added : 2017-04-13 Views :149K

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Voltage Divider

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Voltage Divider


Series Circuits

Take a series circuit with two resistorsSince each is the same resistance, they use up the same amount of voltage, 6VTherefore the voltage at point A is 6V


Series Circuit

We can rearrange the circuit as shown on the right


Series Circuit

And then simplify it once more


Series Circuit



Voltage Divider

It doesn’t matter the amount of resistance, if they are equal they use the same voltageThe voltage at A in this case is still 6V


Voltage Divider

By adjusting the ratio of the resistors, we change how much voltage each one “uses up”The resistance at A is significantly higher now since the second resistor will need much more voltage


Voltage Divider

The resistance at A will now be significantly lower since the first resistor will use up most of the voltageBy altering the ratio of resistors we can alter the voltage at A


Voltage Divider

Suppose we replace the top resistor with a sensor that can change resistanceIn this case a light sensor, photoresistor, that operates from 1k – 10k based on lightBy measuring the voltage at A we can determine the amount of light in the room



Complete the “Sensors in a Circuit” Lab

In Unit 10

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