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WorksheetsDC Review Part I-2020
Total questions: 20
Worksheet time: 10mins
A basic principle of electromagnetism: the magnetic field is ______________ to the current that created it.
perpendicular
180 degrees
parallel to the current
opposite
Saturation is the condition where all the material has been completely magnetized. The domain theory says saturation occurs when all the _____________ are lined up in the same direction.
domains
atoms
electrons
protons
The property that creates a magnetic field is called ________ force.
magnetic
electromotive
magnetomotive
magnetic flux
>Like charges repel is the basic law of:
attraction
magnetism
sameness
What component is measured in ohms?
capacitor
coil
resistor
battery
>Atoms have subatomic particles which are:
fire, water, and oxygen
Proton, electrons, and neutrons
gas, charges, and force
A electrical shock could cause a severe problem if current flows from one hand to the other, right through the heart. An immediate symptom could be _______________ or cardiac arrest.
loss of vision
loss of hearing
fibrillation
numbness
The insulator is used to allow current or voltage to freely flow.
True
False
Use caution when talking to someone that is operating equipment or working in electrical circuits. A distraction could cause:
equipment to become damaged
personal injury
damage to metering equipment
all of these
The basic time-related power unit is the ______.
farads
ohm
amp
joule
Store chemicals and used rags away from the work bench, ideally __________________ rated for the purpose.
in a waste basket
in a metal cabinet
in the work bench drawer
in a area where there are no fires
>With Ohm's Law how could resistance be determined?
Voltage squared
Divide voltage by the current
Resistance times the current
Resistance squared
_____________is an insulator, but not to be trusted around dangerous voltages. This becomes something of a conductor when wet.
Phenolic material
Paper
Dry wood
Epoxy
The proper safety measures for high-current situations are
the same as for high voltage situations, with one addition:
all jewelry should be removed
only earrings should be removed
only wallet chains should be removed
only wrist watch should be removed
The part of the multimeter used to measure current is:
ammeter
ohmmeter
voltmeter
wattmeter
>A resistor that has a value of 200 and no tolerance(+/-) band. It has an acceptable value of:
0.185Ω at 1%
185Ω at 10%
185Ω at 5%
185Ω at 20%
Atoms must contain two subatomic particles
True
False
What type of fire extinguisher is used on electrical fires?
Class A
Class B
Class C
Class D
>Circuit values for resistance and current are provided. Which can be used to determine voltage?
E = IR
E = I/R
E = R/I
E = I + R
Safety googles are needed to protect your eyes from possible injury. As goggles age the likelihood of the plastic becoming brittle and cab be easily scratched or weakened.
True
False
