ELE 100 Exam 1 Review
Low melting point
Fuses are made from materials, which have a ______________melting point
light energy into electricity
a phtovoltaic material is one which converts
solder
a soldering iron or a soldering gun tip is tinned by coating its surfaces with _____
electrons
at its most basic level, a battery is a can full of chemicals that produces _________
nucleus
atomic mass is defined as the mass of a/an
isotopes
atoms of the same element having the same number of protons but different number of neutrons
ions
atoms that lose or gain electrons become
wet cells
cells that have a liquid electrolyte
dry cells
cells which have electrolytes that are a moist paste
resistors
What device inhibits/resists the flow of current in a circuit?
switch
What is the device that is used to open and close a circuit
the capacitance increases
When the plate area of a capacitor increases
Shiny, smooth and a concave fillet
Which of the following statements describes a good solder joint?
stranded
Which wire type is best suited for use as a lamp cord?
a dc current
constant flow of electrons in one direction in an electrical circuit is called
solar cells
devices used to convert solar energy to electricity
negative to positive
direction of electron flow in a circuit is always from
soft soldering
electric soldering is also known as ____ _________
negatively
electron is a __________ charged particle
electrolyte
liquid in the cell is called an
secondary cells
nickel-cadmium, lithium ion and nickel-metal hydride cells are
quartz
one of the materials used to produce electricity by pressure
open
one way to stop the flow of electrons is to ____ the circuit
pressure
piezoelectricity is electricity generated from
temperature
thermocouple is used to measure the
false
true of false: a thermocouple consists of two similar metals bonded together
true
true or false: It's always important to replace a blown out fuse with the proper one.
true
true or false: Nichrome is used as a heating element.
true
true or false: Rosin core solder should be used for all electrical soldering.
true
true or false: Tungsten is used to make light-bulb filaments
false
true or false: a car battery uses zinc paste as its electrolyte
true
true or false: a chematic is used instead of a complex, detailed drawing of an electrical circuit
false
true or false: a group of batteries make up a cell
false
true or false: a primary cell can be recharged
false
true or false: a solid wire is more flexible that a stranded wire
false
true or false: atomic number is defined as the number of neutrons in an atom
false
true or false: dry cells are normally used in cars and trucks
false
true or false: if two wires have the same cross-sectional area and made from the same material, the longer wire will have the lesser resistance
false
true or false: insulators offer very less resistance to the flow of electricity
true
true or false: it is dangerous to charge a non-rechargeable battery
false
true or false: the 4th color in the 5 band color coded resistors indicates the tolerance
false
true or false: two particles with different charges will repel or drive away from each other
true
true or false: wearing safety goggles is very important while soldering
thermistor
what changes resistance with changes in temperature
pink
what color is not used in the resistor value color code?
potentiometers
what is an example of a variable resistor
electrical burns
what is the most common electric shock-related injury
farads
what is the unit for capacitance?
electrolytic
which capacitor is polarized
copper
which metal is a good conductor of electricity because there are many free electrons present in this metal
variable resistor
A rheostat is another name for a
Metals
Materials that allow electricity to flow through them easily
Zero
. Superconductors are materials that exhibit _______________ resistance to the flow of electricity
Elecetrocution
Death caused by shock
switches
Devices used to open and close circuits without the inconvenience of disconnecting and reconnecting wires are called ________________.
the same rating, but higher working voltage
If replacement capacitors are not available, you should substitute it with a capacitor that has
dischargering
Never touch a capacitor without first ____________________it
Circuit-breakers, Fuses and Ground-fault interrupters
Safety-devices in electrical circuits are
National Electric Code
The _____________ contains the general rules and regulations that contractors, builders and manufacturers must follow for proper installation and routing of wires.
Rubber, Mica and Plastic
The best insulators are
surface area, distance between the plates and the insulating material
The three factors that affect capacitance are
Wire strippers and Knives
Tools used to remove insulation from wires.
True
True or False: All electrical circuits have to be grounded
True
True or False: Grounding involves providing a conductor to carry current
False
True or False: Wet conditions decrease the risk of electrical shock by lowering skin resistance.
bigger
the smaller the gauge (AWG number) of a wire the ______ the size of the wire.
tin and lead
soft solder is an alloy of ___ and ____
lower
soldering is the process of joining metals using another metal that has a _____ melting point
hydrometer
something used to measure the specific gravity of the acid used in a storage battery
Capacitor
stores energy and changes
terminals
the areas of a battery that are marked positive and negative are called
energy source, switch, conductive path and load
the basic parts of a circuit are
an electrochemical cell
the device that produces electricity from chemical reaction is called
generator
the machine that generates electricity from magnetism is called a