1. The no-load terminal voltage of a battery is 30 V. The terminal voltage drops to 22 V when supplying a current of 5 A. Determine the emf and the internalresistance of this battery. Ans. r= 1.6 ohm 2. Two identical zinc carbon batteries are available. When connected in series, they supply 0.5 A to a 4 ohm resistor. When connected in parallel, they supply 0.4 A to a 5 ohm resistor. Determine the emf and internal resistance of each battery. Ans. 2.667 V and 3.333 ohm3. When supplying a current of 5 A, the terminal voltage of a battery is 15 V. The battery is then recharged at a rate of 3 A and the terminal voltage is found to be 21 V. Determine the emf and the Internal resistance of the battery. Ans. 18.75 V and 0.75 ohm4. A battery with an emf of 12 V and an internal resistance of 0.8 ohm is to be recharged through a 20 V source. (a) show by means of a diagram the connection of the circuit elements. (b) What is the current in the circuit? (c) The recharging current is to be limited to 3 A. What is the value of the limiting resistor? Ans. (b) 10 A (c) 1.867 ohm5. Three identical batteries are available. When the three batteries are in series, theterminal voltage of the system is 15 V when supplying 6 A. When reconnected inparallel, the terminal voltage of the system drops to 6 V when supplying current tothe same resistor as before. Determined the current supplied by the parallelsystem, the emf and the internal resistance of each batter. Ans. 2.4 A, 6.154 Vand 0.192 ohm6. A 12 V generator has an internal resistance of 0.05 ohm. Two loads are connected in parallel to its terminals, one drawing a 12 A current and the other dissipating energy at the rate of 200 W. What is the terminal voltage of thegenerator with this load? Ans. 0.82 volts7. When the automatic gain control voltage of a radio receiver is measured with a vacuum tube voltmeter whose input resistance is 10 M-ohm, it reads 4.5 V. When an ordinary voltmeter whose input resistance is 10 k-ohm is also connected across the AGC voltage source, both meters read 0.40. What is the internal resistance of the AGC voltage source? Ans. 103.561 k-ohm8. A phonograph pick up develops an open-circuit emf of 50 mV and has an internal resistance of 1200 ohm.A. What voltage will it develop across a 4 ohms load resistance?B. What value of load resistance must be used to obtain a 75% eff?C. What is the maximum power output of the pickup?Ans. a) 38.46 mV b) 3.6 k-ohm c) 5.19x10-7 watts 1. The no-load terminal voltage of a battery Is 30 V. The terminal voltage drops to22 V when supplying a current of 5 A. Determine the emf and the internalresistance of this battery. Ans. r= 1.6 ohm2. Two identical zinc carbon batteries are available. When connected in series, theysupply 0.5 A to a 4 ohm resistor. When connected in parallel, they supply 0.4 A to a5 ohm resistor. Determine the emf and internal resistance of each battery. Ans.2.667 V and 3.333 ohm3. When supplying a current of 5 A, the terminal voltage of a battery is 15 V. Thebattery is then recharged at a rate of 3 A and the terminal voltage is found to be 21V. Determine the emf and the internal resistance of the battery. Ans. 18.75 V and0.75 ohm4. A battery with an emf of 12 V and an internal resistance of 0.8 ohm is to berecharged through a 20 V source. (a) show by means of a diagram the connectionof the circuit elements. (b) What is the current in the circuit? (c) The rechargingcurrent is to be limited to 3 A. What is the value of the limiting resistor?Ans. (b) 10 A (c) 1.867 ohm5. Three identical batteries are available. When the three batteries are in series, theterminal voltage of the system is 15 V when supplying 6 A. When reconnected inparallel, the terminal voltage of the system drops to 6 V when supplying current tothe same resistor as before. Determined the current supplied by the parallelsystem, the emf and the internal resistance of each batter. Ans. 2.4 A, 6.154 Vand 0.192 ohm6. A 12 V generator has an internal resistance of 0.05 ohm. Two loads areconnected in parallel to its terminals, one drawing a 12 A current and the otherdissipating energy at the rate of 200 W. What is the terminal voltage of thegenerator with this load? Ans. 0.82 volts7. When the automatic gain control voltage of a radio receiver is measured with avacuum tube voltmeter whose input resistance is 10 M-ohm, it reads 4.5 V. Whenan ordinary voltmeter whose input resistance is 10 k-ohm is also connected acrossthe AGC voltage source, both meters read 0.40. What is the internal resistance ofthe AGC voltage source? Ans. 103.561 k-ohm8. A phonograph pick up develops an open-circuit emf of 50 mV and has an internalresistance of 1200 ohm.A. What voltage will it develop across a 4 ohms load resistance?B. What value of load resistance must be used to obtain a 75% eff?C. What is the maximum power output of the pickup?Ans. a) 38.46 mV b) 3.6 k-ohm c) 5.19x10-7 watts9. Determine the currents I1, 12, and 132 ohm3 ohm3 ohmI112136 V6 V3 V9. BONUŞ PROBLEM, OPTIONAL10. What bleeder resistor is required to complete a voltage divider to give 300 v at40 mA from a 500 V source of emf if the series dropping resistor is 4 k-ohm. Ans.30 k-ohm

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The no-load terminal voltage of a battery is 30 V. The terminal voltage drops to 22 V when supplying a current of 5 A. Determine the emf and the internal resistance of this battery. Ans. r= 1.6 ohm