Quiz For Lesson 12:

Practical Electricity


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Its highest AC volts position, or "OFF."
"Off" or a milliamp setting.
Ohms x 1000.
Zero the needle.


Hold the test prods by their metal tips.
Set the function selector to the ohms range.
Handle the prods by their plastic insulators.
Touch the prods together.


Give more precise readings than if the current has been turned off.
Reverse the polarity of the leads in an American made meter.
Reverse the polarity of the leads in a Japanese made meter.
Give an incorrect reading and possibly damage the meter.


The ohmmeter needs a new internal battery.
The Ω x 1 scale is damaged.
The ohms scale is easier to read between its midway point and zero charge.
The internal battery makes the black lead positive.


In parallel.
In series.
With clip-on leads.
so that its red lead is negative.


Thousandths of an amp.
Millionths of an amp.
Millions of amps.
A unit of resistance.


Divide your reading by 70.7.
Multiply your reading by 70.7.
Multiply your reading by 1.414.
Divide your reading by 1.414.


Unplug the circuit from the wall.
Obtain a digital multimeter.
Make several meter readings.
Check the batteries and battery contacts.


Infinite ohms with the switch closed.
Zero ohms with the switch closed.
Zero ohms with the switch open.
Infinite ohms when the switch is open and when it is closed.


An arkansas stone.
A file.
A pencil eraser.
A contact burnisher.


Will have to be replaced.
Should be good.
Is a 100Ω, 10 watt discharging resistor.
Needs to be charged before you make a reading.




Illustration for Question 12.

This diagram is used for Question 12.


The battery tester is defective.
The battery was near the end of its life when it was tested.
The battery's internal resistance has decreased.
The battery tester predicts life remaining in a battery.


A voltage reading at its terminals is about 1.25v
A voltage reading that is the reverse of the battery's marked polarity.
That the battery has developed a memory.
The battery having an open circuit voltage.


4.5 volts.
2 volts.
4.05 volts.
6 volts.


5 KΩ.
20 KΩ.
17 KΩ.
12 KΩ.


Illustration for Question 16.

This diagram is used for Question 16.


Is 18, 22, or 24 gauge.
Removes thin oxide layers and helps the solder flow.
Will be in the 25 to 35 watt range.
Can destroy your circuit.


Dull black.
Rated at 25 to 35 watts.


To have clean conductors and a properly tinned iron.
To tin the PC board.
Using a desoldering wick.
Applying some solder to the iron, the touching the iron to the board.


Plunge the iron into cold water to cool it quickly.
Slip a small piece of shrink tubing over the top.
Tin the tip, then unplug the iron and allow it to cool.
Select the correct wattage for the job.





Leaf shutter diagram.






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