5.29 A power supply is an instrument or circuit that produces a steady voltage similar to a battery. A good power supply produces an almost constant voltage and has almost zero Thevenin resistance. In the power supply of Fig. 5-28a there is an adjustment for changing the output voltage from 10 to 30 V. This being the case, what is the minimum load power with a 100-0 load? The maximum load power? 5.30 What current rate should the fuse of Fig. 5-28b have if it is to blow whern A short is between the A-B terminals b. A 2-Q load is between the A-B terminals C. To get the maximum load power in Fig. 5-28c, what value should Ri have? What is the resulting load power? A radar antenna has a Thevenin voltage of 100 μν and a Thevenin resistance of 50 Ω, what value should a load resistance have to get the maximum power? What is the maximum load power? A 75-Q load is between the A-B terminals 5.31 5.32 5.33 We want to get the maximum load power in a 10-k Q resistance of Fig. 5-28d. What value 5.34 Calculate the power in the 10-k Ω resistance of Fig. 5-28d when RTH is adjusted to 10 k Ω. Also 5.35 A signal generator has a Thevenin voltage of 10 V and a Thevenin resistance a 600 Ω. what is 5.36 A TV antenna has a Thevenin voltage of 20 mV and a Thevenin resistance of 300 Ω, when the 5.37 Figure 5-29 shows a black box with a Thevenin voltage of 10 V and a Thevenin resistance of 50 should RTH be adjusted to? what is the maximum power in the 10-k Ω resistance? work out the load power when Rn is adjusted to zero. the maximum load power you can get out of this signal generator? receiver is matched to the antenna, what is the power to the receiver? . Convince yourself that the maximum load power occurs when R is S0 Q load power for each of these by calculating the R,#25 Ω R, open circuit (infinite Ω) 17