EE215_Lab1

# A large part of engineering knowledge is learning

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Unformatted text preview: urrent through each resistor and the total current leaving the battery in the circuit of part a using the measured component values from part c. Note whether this number is within the range computed in part b. 4. e (3 points) • • Build the circuit in part a using the components you measured, and measure the actual current through each resistor, and the total current leaving the battery. Discuss any differences with the result from part c. 4. f (2 points) • • Compute the power dissipated in each resistor. Do you expect either resistor to be hot? Check by touch – careful. Don’t get burned. 4. g (4 points) • Describe in detail a specific example in current technology where a current divider is used. Procedure 5 (20 points) Voltage Divider Design Figure P5 ­1 shows a transistor amplifier circuit, the basis for any number of electronic products like cell phones, radios and stereos. An important part of designing this circuit is biasing the transistor, meaning to set the steady state DC voltage of the transistor base, vb. This is done with a voltage divider consisting of resistors R1 and R2. At first glance, R1 and R2 are not in a voltage divider configuration. There are two additional connections to node b, which connects the resistors. However, by using some knowledge about the circuit and the conditions of interest, both of these connections will prove to be approximately open circuits. The first connection is a capacitor between node b and the input vin. In steady state DC, capacitors are open circuits (see procedure O1 in this lab, for example). So for purposes of biasing the transistor, the connection to vin is an open circuit. The second connection is the transistor base. When you learn about trans...
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