Physics Principles and Problems 2009

Section 22.2 : Using Electric Energy

Self-Check Quizzes

1
The rate at which energy is changed is _____.
A)power
B)current
C)resistance
D)potential difference
2
What is the thermal energy supplied in 1 minute by an appliance with power dissipation of 1.2 kW.
A)1.2 kJ
B)72 kJ
C)0.02 kJ
D)43.2 kJ
3
Why are superconductors often impractical?
A)They are too expensive.
B)They are too large for everyday use.
C)They must be kept at very low temperatures.
D)There are no superconducting materials available today.
4
Why does output voltage from a generating plant need to be high.
A)to improve resistance
B)high voltage is needed for homes and businesses
C)to make use of the vast hydroelectric potential
D)to reduce energy wasted
5
What unit is used by electric companies to measure energy sold?
A)kilowatt-hours
B)joules
C)amperes
D)ohms
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