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