Electricity 1 Flashcards
When amber was rubbed with other materials, it became charged with a mysterious force. What was it rubbed with?
Dried leaves and wood shavings.
Benjamin Franklin called the attractive and repellant kinds of electricity…
Positive and Negative
Electricity is produced by ______ and ________.
Electrons and Protons
Matter is…
Anything that has weight and occupies space.
______ are the basic materials that make up all matter.
Elements
Water is made of
Hydrogen and oxygen.
Salt is made of sodium and
Chlorine.
The atomic number is the same as an atom’s number of
Protons.
A proton is 1/3 the diameter of an electron but contains _______ times more mass.
1840
Charged atoms are called
Ions
The atoms of all the known elements can have up to _____ shells.
Seven
Electricity is produced when____ are freed from their orbits.
electrons
Materials that have electrons that are freed easily are called ______?
Conductors
Insulators are materials where their electrons are freed _____
difficultly.
Electricity as a result of rubbing materials together is called _____.
Triboelectricity
Piezoeletricity is the result of _______
Pressure being converted into electricity.
Electric current travels at ________.
the speed of light
When a good conductor is put directly across the terminals of a power source,
a short circuit is produced.
Electric current travels from ___ potential to ___ potential.
Low, high
Charge is determined by the number of electrons that the object has ________.
lost or gained
Light can also be produced from _______, _______, and ________.
Fluorescence, phosphorescence, and electroluminescence.
Any conductor that carries an electric current will act like a ______.
Magnet
You can demagnetize an object by _______, _________, and _______.
Striking, heating, and applying a rapidly reversing field.
The compass needle points to the _____ magnetic pole.
North
Flux lines are compressed in the center of the loop to create a strong field. The north side is the side that the lines of flux ____.
Come out
A close-wound solenoid will create a ____ magnetic field.
Stronger
A holding relay has an extra set of contacts that _________ after the main switch is closed.
Stays closed
A buzzer’s contacts are arranged so that the electromagnetic coil cannot stay ________ continuously.
Energized
The _________ switches the wires outside the generator while the rotor turns so that the current will flow in the same direction through the meter at all times.
Commutator
An electric circuit consists of ________, _________, and ________.
- A power source 2. Conductors 3. A load
A ______ is any device that uses electric energy.
Load
EMF is measured in _____.
Volts
2 factors determine how much current will flow in a DC circuit, ______, and _______.
Applied voltage and conductance of the wires and the load
is how easily electricity flows in a circuit.
Conductance
______ has the greatest conductance.
Silver
Resistance of a material (element) depends on ________.
The number of free electrons it has
The greater the cross-sectional area of a conductor, the _____ the resistance.
Lower
The resistance of the load is normally much _____ than the wiring.
Greater
Every power source has some internal ________.
Resistance
