E8. In the circuit shown, the 1 $2 resistance is the internal resis- E12. Three identical resistances, each 30 0, are connected i tance of the battery and can be considered to be in series, as parallel with one another as shown. The combination shown, with the battery and the 14 2 load. connected to a 12-V battery whose internal resistance a. What is the current flowing through the 14 2 resistor? negligible. b. What is the voltage difference across the 14 2 resistor? a. What is the equivalent resistance of this parall combination? 6 V b. What is the total current through the combination? c. How much current flows through each resistor in tl combination? 214 02 12 V 30 0 30 02 3042 E8 Diagram E9. Three resistors are connected to a 12-V battery as shown. The internal resistance of the battery is negligible. a. What is the total resistance in the circuit? E12 Diagram b. What is the current coming from the battery? E13. A 9-V battery in a simple circuit produces a current of 1.5 c. What is the current through the 15 2 resistance? through the circuit. How much power is being delivered d. Does the same current flow through the 25 2 resistance? the battery? e. What is the voltage difference across the 20 2 resistance? E14. An 80 Q resistor has a voltage difference of 12 V across 15 Q leads. a. What is the current through the resistor? b. What is the power being dissipated in this resistor? E15. A 75-W lightbulb operates on an effective ac voltage 12 V 20 Q 110 V. a. What is the effective current through the lightbulb? 25 Q b. From Ohm's law, what is the resistance of the lightbull M E16. A toaster draws a current of 9.0 A when it is connected to E9 Diagram 110-V ac line. E10. Two resistors, each having a resistance of 40 2, are con- a. What is the power consumption of this toaster? nected in parallel. What is the equivalent resistance of this b. What is the resistance of the heating element in 1 toaster? combination? Ell. Three resistors of 9 0, 12 0, and 15 $2 are connected in E17. A clothes dryer uses 6600 W of power when connected to parallel with one another. What is the equivalent resistance 220-V ac line. How much current does the dryer draw fro the line? of this combination?1. An air-filled L=39.1 jH solenoid has a length 4 cm and cross-sectional area A=0.6 cm?. How many turns are in this solenoid? a) 144 b)215 c)462 d) 1543 e)None of this is true 2. If current in a 180 mH coil changes steadily from 20mA to 38mA in 340ms, what is the induced emf: a) 1. 9v b) 2.5V c) 9.5mv d) 22mv e) None of these is true