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Series or Parallel?
June 2003
Question 63
Answer  Parallel  same V
Electric Energy and Heat
(W) Electric energy consumed or released as
heat
(All equations on reference table)
(J) W =
Pt = [V^{2}/R]t
= VIt =
I^{2}Rt
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 10^{3} J 
c) 3.6 x 10^{4} J 
b) 3.0 x 10^{2}
J 
d) 3.6 x 10^{3}
J 
V = 120 V
I = 10. A
t = 30. sec
W = ?
W = VIt
= 120. V(10. A)(30. sec)
W = 3.6 x 10^{4} J
What's wrong with this picture?
Ammeter should be
in series with resistor

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