Electric Energy and Heat Problems with Solutions

Try this at Home!

Series or Parallel?

Answer - Parallel - same V

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

Show Me The Physics
Animations

Circuits - Series and Parallel

Electricity Unit Review