1 / 10

Ohm’s Law

Ohm’s Law. Ohm's Law. For a metal conductor at a constant temperature :. I α V. I α V/R. I α 1/R. I = k V/R. I = V/R. R = V/I. V = IR. Ohm’s Law: In a metal conductor at a constant temperature. Electrical Power. P = Work (energy)/t. W = VQ.

ernst
Download Presentation

Ohm’s Law

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. Ohm’s Law

  2. Ohm's Law

  3. For a metal conductor at a constant temperature: I α V I αV/R I α 1/R I = k V/R I = V/R R = V/I V = IR

  4. Ohm’s Law: In a metal conductor at a constant temperature

  5. Electrical Power P = Work (energy)/t W = VQ P = VQ/t = V(Q/t) P = VI Energy (work) = Pt = VIt

  6. Relating Power and Resistance P = VI I = V/R P = V2/R P = I2R P = VI V = IR

  7. Electric motor operates @ 120 V, draws 1.50 A of current, runs for 4.0 s. Motor lifts 10 kg mass at 1.5 m/s. Resistance: Power: Electrical Energy: Charge passing through motor: 80.0 Ω 180 w 720 J 6.0 C Efficiency of motor: 83%

  8. A 12 watt lamp is powered by a 6.0 V battery. Resistance: 3.0 Ω How many J/s are consumed by the bulb? 12 J/s

  9. A 1000 w appliance designed for a 120-V circuit is plugged into a 240-V circuit. Assuming the resistance is constant, how much power is drawn? P α V2 4000 w

More Related