Physics 1b Quiz
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4A
Form
PHYSICS 1B QUIZ #3 FALL QUARTER 2009
Answer Key
YOUR NAME __________________
____________________________(PRINT NEATLY!)
YOUR PID NUMBER__________________________________________________ (PRINT NEATLY!)
INSTRUCTIONS: THERE ARE 10 QUESTIONS ON THIS QUIZ. PLEASE FILL IN THE SCANTRON FORM
USING A NUMBER 2 PENCIL. Note: Any confirmed case of cheating will result in an “F” grade in Physics 1B and
referral to the dean for disciplinary action.
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1. A 20- Ω platinum wire at 20°C with a temperature coefficient of resistivity of 3.9 × 10
(°C)
will have what
resistance at 100°C?
=
1 +
−
= 20 1 + 3.9 × 10
80 = 26Ω
a. 14 Ω
b. 20 Ω
c. 26 Ω
d. 28 Ω
2. A turbine at an electric power plant delivers 4,500 kW of power to an electrical generator which converts 95% of this
mechanical energy into electrical energy. What is the current delivered by the generator if it delivers at 3,600 V?
95
=
× 4500 × 10 = 4.28 6
100
.
= × ∆ => =
= 1.2 3
3
a. 0.66 × 10
A
3
b. 1.0 × 10
A
3
c. 1.2 × 10
A
3
d. 5.9 × 10
A
3. Number 10 copper wire (radius = 1.3 mm) is commonly used for electrical installations in homes. What is the voltage
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drop in 40 m of #10 copper wire if it carries a current of 10 A? (The resistivity of copper is 1.7 × 10
Ω.m.)
40
=
= 1.7 × 10
= 0.13Ω
1.3 − 3
=
= 10 × 0.13 = 1.3
a. 1.3 V
b. 0.77 V
c. 0.50 V
d. 0.13 V
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