Power in DC Circuits - Part II P P, PRI 90Vdc R PR () 300 S With an assumed input voltage of 90 V dc, calculate the power dissipated in each resistor and the total power dissipated. PRI Figure 9-4. No W R, W 600 14. Knowing that the power supply must furnish the total power P, and the supply voltage is 90 V dc, calculate the value of the supply current I. LP,/E_ W 15. Insert your milliammeter in the circuit (shown in Figure 9-4 to measure the total circuit current. A Is there agreement between your calculated and your measured values of L. Explain. Yes REVIEW QUESTIONS 1. Calculate the power dissipated in each resistance as well as the total power for each of the circuits shown in Figure 9-5. A 4.A (a) 1A R LA 3A R [Tea BA (c) R 50% R -60V (b) 4A Figure 9-5. 2. Round 2 mm copper wire has a resistance of 5.58 0 per kilometer. 2. Round 12 gauge copper wire has a resistance of 1.6 0 per thousand feet. a. Calculate the power lost in a 2 mm copper wire conductor 50 m long carrying a current of 10 A. a. Calculate the power lost in a 12 gauge copper wire conductor 200 ft long carrying a current of 10 A. b. What is the voltage between the two ends of the conductor in (a)? 3. The shunt field winding of a DC motor has a resistance of 240 0. Calculate the power loss when the voltage across it is 120 V dc.