Physics Principles and Problems 2009

Section 23.2 : Applications of Circuits

Self-Check Quizzes

1
When appliances are connected in parallel, the equivalent resistance is _____ and the current in the wires _____.
A)reduced, increases
B)increased, decreases
C)reduced, decreases
D)increased, increases
2
A fuse will _____ when too large a current passes through it.
A)open
B)divert current
C)melt
D)ground some current
3
What can happen if a large current produces a lot of thermal energy in the wiring of your house?
A)The power supply to your house could be cut off.
B)An increase in power to the outlet could result.
C)The insulation on the wires could melt.
D)The lights may dim.
4
Which is not a safety device for your home?
A)ground-fault interrupter
B)fuse
C)circuit breaker
D)ammeter
5
Why is a voltmeter made to have high resistance?
A)so that the wires don't get too hot
B)to cause the smallest possible change in current and voltage
C)to make a combination series-parallel circuit
D)to increase the current through the device
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