EVALUATION AND REVIEW QUESTIONS: 1. (a) If all of the resistors in Figure 7-4 were 10 times larger than the specified values, what would happen to the output voltage? 2. 3. (b) What would happen to the power dissipated in the voltage divider? Refer to Figure 7-3(b). Assume Vs is +10.0 V. (a) (b) If R, is open, what is the output voltage?. If R, is open, what is the output voltage?. If a student used a potentiometer in the circuit of Figure 7-3(b) that was 10.0 kf instead of 1.0 kf, what would happen to the range of output voltages? 4. For the circuit in Figure 7-7, compute the output voltage for each position of the switch. 5. VB Vc Vp Compute the minimum and maximum voltage available from the circuit shown in Figure 7-8. VMIN= VMAX= R₂ +10 V Ry www w www 9.0 kQ B R 900 Q 100 Q C +12 V D R₂ 90 Q 10 Q2 Figure 7-7 50 w w Figure 7-8 6. (a) Compute the power dissipated by each resistor in Figure 7-8. (b) Why isn't the power dissipated affected by Vour? Figure 7-2 Voltage dividers can be made to obtain variable voltages by using a potentiometer. The full ran of the input voltage is available at the output, as illustrated in Figure 7-3(a). If you want to limit the of the output voltage, this can be done by using fixed resistors in series, as illustrated in Figure 7-3(b). RI 330 N www ww Vs +10 V POT 1 ΚΩ - Vx +10 V Figure 7-3 (b) www R2 470 2 R POTOVX 78 78 R₁ 330 Q ww R₁₂ 470 Q R₁ 680 Q www w Figure 7-4 RA 1000 Q