B-005-02: Concepts of current, voltage, conductor, insulator, resistance
B-005-02-01:
Name three good electrical conductors.
Gold, silver, aluminum
Gold, silver, wood
Copper, aluminum, paper
Copper, gold, mica
B-005-02-02:
Name four good electrical insulators.
Glass, air, plastic, porcelain
Plastic, rubber, wood, carbon
Paper, glass, air, aluminum
Glass, wood, copper, porcelain
B-005-02-03:
Why do resistors sometimes get hot when in use?
Some electrical energy passing through them is lost as heat
Their reactance makes them heat up
Hotter circuit components nearby heat them up
They absorb magnetic energy which makes them hot
B-005-02-04:
What is the best conductor among the following materials?
copper
carbon
silicon
aluminium
B-005-02-05:
The material listed, which will most readily allow an electric current to flow, is called?
a conductor
an insulator
a resistor
a dielectric
B-005-02-06:
A length of metal is connected in a circuit and is found to conduct electricity very well. It would be best described as having a:
low resistance
high resistance
high wattage
low wattage
B-005-02-07:
The letter "R" is the symbol for:
resistance
impedance
reluctance
reactance
B-005-02-08:
The reciprocal of resistance is:
conductance
reactance
reluctance
permeability
B-005-02-09:
Voltage drop means:
voltage developed across the terminals of a component
any point in a radio circuit which has zero voltage
difference in voltage at output terminals of a transformer
the voltage which is dissipated before useful work is accomplished
B-005-02-10:
The resistance of a conductor changes with:
temperature
voltage
current
humidity
B-005-02-11:
The most common material used to make a resistor is:
carbon
gold
mica
lead
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