1. Class Discussion 2.2 Improper Application of a Voltage Divider Kyle I. Platt Mechatronic Systems EAS 5407

2. Ohm’s Law V = IR R = V/I –If your needed current output goes up, you need to step down the voltage. –Assuming your load impedance is constant.

3. Voltage Divider

4. Power Power is equal to the following 3 expressions

5. Example Circuit Problems that can occur: If one resistor fails, whole circuit fails Failure can occur by not using a resistor with the correct allowable power rating. Certain Resistive materials are a function of voltage. If the supply voltage versus the desired output voltage is to great, the resistivity values for the resistor can change.

6. Power in Voltage Divider Circuits If the load, R2, requires a high current and a low voltage then the following: –For resistors in series, current is constant Power rating for resistor R1 will be high For high current devices (operation critical), the circuitry leading up to that load should be designed to account for any faults in the system, including current/voltage spikes.

7. Conclusions For power hungry devices which are critical to the overall operation of the deliverable, it is recommended to use a voltage regulator. –Such devices are inexpensive and are readily available –Such devices are designed to account for high current and Voltage/Current spikes Input Output Ground Fixed Voltage Regulator