Electricity Flashcards
What does increasing the diameter of a wire do to its resistance?
It would reduce the resistance.
Gauge is the measure for wire thickness. The lower the gauge the thicker the wire. Low gauge wire has less resistance.
What three things affect a materials resistance?
Thickness, Length, Temperature, (Composition)
Resistance is a materials ability to conduct electrons
If the current of a device is 2 amps and its resistance is 10 ohms what is the voltage of the device?
20v
(2 amps)(10 ohms)=20v
What type of signal is sent by rapidly changing current between two set positions?
Digital Signals
As opposed to analog signals that are sent by smoothly changing the current through a multitude of positions.
What two things determine the strength of an electric field?
The distance from the charge.
The amount of the charge that produced the field.
What is the unit for electrical power?
Watt
A material that has electrons that are tightly bound to its atoms is generally an…?
Insulator
Tightly bound electrons do not flow easily.
A power cord is made up of a copper wire surrounded by a rubber coating. Explain why these two material were chosen to make a power cord.
The copper is a conductor which allows electrons to flow through.
The rubber is an insulator which keeps electrons from flowing outside of the wire.
What is the purpose of a circuit breaker?
To open a circuit when the wattage flowing through the circuit gets too high. This prevents damaging devices that are plugged in to the circuit.
What is the purpose of a ground fault circuit interrupter? (GFCI outlet)
It shuts off a circuit in case of a short circuit.
GFCI outlets should be used anyplace where water may get into an outlet.
The type of current that is supplied through wall outlets in the U.S. is…?
Alternating current.
The direction of the current cycles 60 times per second (hz) in the U.S.
Ever wonder why the plugs are different in Europe?
How many paths can electricity follow in a series circuit?
One
As opposed to a parallel circuit which has multiple paths.
What is maintained across the terminals of a battery? (2 answers)
A voltage drop
A potential difference
What type of current is produced by a battery?
Direct Current
What information do you need to know to calculate the power consumption of an appliance? What do you do with this information?
You need to know the amps and the voltage.
Multiply the amps times the volts.
The test question is similar but different.
