1 / 24

Watt’s Law Practice

Watt’s Law Practice. Problem #1. A typical lightbulb uses 0.83A of current. If it is connected to a 120V outlet, how much power does it use?. Problem #1 Answer. P = 100 Watts. Problem #2. A 110V power supply is hooked up to a speaker that uses 200W. How much current does it use?.

noel-noble
Download Presentation

Watt’s Law Practice

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Watt’s Law Practice

  2. Problem #1 A typical lightbulb uses 0.83A of current. If it is connected to a 120V outlet, how much power does it use?

  3. Problem #1 Answer P = 100 Watts

  4. Problem #2 A 110V power supply is hooked up to a speaker that uses 200W. How much current does it use?

  5. Problem #2 Answer I = 1.8 Amps

  6. Problem #3 • A 1000 resistor connected to a 6V power source will produce__________ A of current and use ___________ Watts of power. • Hint: Use Ohm’s law for the 1st answer!!

  7. Problem #3 Answer I = 0.006A or 6mA P = 0.036 Watts

  8. Problem #4 • A 300, 0.25 Watt resistor can be connected to a voltage source as high as ___________ without exceeding its wattage rating.

  9. Problem #4 Answer V= 8.66V

  10. Problem #5 • A 200 resistor conducting 0.05A will use up _________ Watts of power

  11. Problem #5 Answer P = 0.5 W

  12. Problem #6 • The maximum voltage that can be applied to a 0.5W, 1200 resistor without exceeding its wattage would be ________volts.

  13. Problem #6 Answer V=24.5V

  14. Problem #7 • The maximum voltage that can be applied to a 1200, 1/4W resistor without exceeding its wattage rating would be _________volts.

  15. Problem #7 Answer V= 17.3V

  16. Problem #8 • A 9000 resistor conducting 1.2A will use up _________ Watts of power.

  17. Problem #8 Answer P = 12,960 Watts

  18. Problem #9 A car battery causes a current of 2A through a light and produces 12V across the light. What is the power used by the light?

  19. Problem #9 Answer P = 24 Watts

  20. Problem #10 A flashlight bulb is rated for 0.9 Watts. If the voltage on the bulb is 3V, how much current goes through it?

  21. Problem #10 Answer I = 0.3A

  22. Homework Problem #1 • A 60W light bulb in a lamp is connected to a 120V outlet. • How much current does it use?

  23. Homework Problem #2 • A typical 1200W microwave uses 11A of current. • How much voltage must it be using?

  24. Homework Problem #3 • An 1800 Ohm resistor can take up to 4.5W of power. • How much voltage does it use? • How much current does it use?

More Related