15. a SECTION 4.2 Ohm\'s Law 1. is the voltage across a 220 n resistor if the cu

Question

15. a SECTION 4.2 Ohm's Law 1. is the voltage across a 220 n resistor if the current at b. through it is 5.6 mA? 2. What is the current through a 2.2 kn istor if the voltage 16. a drop across it is 24 V? 3. How much resistance is required to limit the current to 1.5 mA if the potential drop across the resistor is 24 V? 4. At starting, what is the current drain on a 12 v car battery if the resistance of the starting motor is 40 mn? 5. If the current through a 100 kn resistor is 3.6 HA, what is the voltage drop across the resistor? 6. If a voltmeter has an internal resistance of 50 km, find the current through the meter when it reads 120 V 7. If a refrigerator draws 2.2 A at 120 V, what is its resistance? 8. If a clock has an internal resistance of 8 kn, find the current through the clock if it is plugged into a 120 V outlet. *18. Sk 9. A washing machine is rated at 4.2 A at 120 V. What is its ha internal resistance? 10. A CD player draws 80 mA when 4.5 V is applied. What is ho the internal resistance? 11. The input current to a transistor is 20HA. If the applied Sc (input) voltage is 24 mv, determine the input resistance of ag the transistor. *19. a. 12. The internal resistance of a dc generator is 0.5 n. Deter. mine the loss in terminal voltage across this internal resist- ance if the current is 12 A. +13. a. If an electric heater draws 9.5 A when connected to a a 120 v supply, what is the internal resistance of the heater? b. Using the basic relationships of Chapter 2, determine SECTIC how much energy in joules (J) is converted if the heater is used for 2 h during the day. 20. If 14. In a TV camera, a current of 5.6 mA passes through a resis tor of 3.3 Mn. What is the voltage drop across the revirtuun wh 21. Th

Explanation / Answer

7)
V = 120 V
I = 2.2 A

use Ohm's law:
R = V/I
= 120 V/2.2 A
= 54.5 ohm

Answer: 54.5 ohm

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