St. Mary's H.S. Physics - Electric Energy and Heat

Home

Try this at Home!

30 seconds with Mr. G

Series or Parallel?

June 2003 Question 63

Answer - Parallel

Electric Energy and Heat

(W) Electric energy consumed or released as heat

(All equations on reference table)

(J) W = Pt = [V²/R]t

= VIt = I²Rt

An electric iron operating at 120 volts draws 10. amperes of current. How much heat energy is delivered by the iron in 30. seconds?

a) 1.2 x 10³ J	c) 3.6 x 10⁴ J
b) 3.0 x 10² J	d) 3.6 x 10³ J

V = 120 V

I = 10. A

t = 30. sec

W = ?

W = VIt

= 120. V(10. A)(30. sec)

W = 3.6 x 10⁴ J

What's wrong with this picture?

Ammeter should be
in series with resistor

Larger Version

St. Mary's H.S. Animations

Electrons & Conductivity

Resistance in a Wire

Attaching Meters

Ohms Law - V & I

Circuits - Series and Parallel

Circuits & Total Resistance

Series Circuit Game

Parallel Circuit Game

Scientific Advisors: Dr. Saul Dushman; Dr. Roman Smoluchowski; Dr. David Harker

Prelinger Archives

Production Company: Wolff (Raphael G.) Studios, Inc. Audio/Visual: sound, color
Creative Commons license: Public Domain

Electricity Unit Review

Magnetism