Term
The first recorded references to static electricity and lightning were made over 2,500
years ago by |
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Definition
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Term
| Describe the first experiment with static electricity |
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Definition
| Amber was rubbed against cloth which caused the amber to attract straw. |
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Term
| In 1600, Dr. William Gilbert coined the term “electrica,” a word that gave rise to our word electricity. What does this term “electrica” describe |
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Definition
| It describes what happens when certain materials are rubbed against amber |
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Term
| What is the difference between a conductor and an insulator in terms of electrons? |
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Definition
| Conductors have free electrons and insulators do not. |
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Term
| Name four metallic conductors. |
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Definition
| Copper, Gold, Silver, Aluminum |
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Term
| Which metallic conductor of the four is the best conductor? |
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Definition
| Copper (because it’s cheap), Gold is actually the BEST conductor |
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Term
| Name five common materials that are insulators. |
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Definition
| Glass, Air, Plastic, Rubber, and Wood |
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Term
| The movement of electrons between atoms is called an |
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Definition
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Term
| The energy produced as a result of this flow of electrons from atom to atom is called |
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Definition
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Term
| What unit measures the flow of electrons? |
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Definition
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Term
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Definition
| One coulomb of charge flowing past a point in one second |
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Term
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Definition
| the charge carried by 6.25 x 1018 electrons |
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Term
| Name the instrument used to measure the amount of amps flowing in an electrical circuit. |
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Definition
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Term
| What is the force that causes electrons to move in an electrical circuit? |
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Definition
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Term
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Definition
| A volt is 1 joule of energy per 1 coulomb of charge |
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Term
| What unit used to measure EMF? |
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Definition
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Term
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Definition
| Batteries, Generators, Photovoltaic Cells (solar cells) |
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Term
| What happens to the electron flow within a conductor if the EMF or voltage source is removed? |
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Definition
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Term
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Definition
| a force opposing the flow of electron current in a conductor |
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Term
| State one example when resistance is undesirable. |
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Definition
| When a wire is too small it can get hot or burn |
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Term
In what units is resistance measured?
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Definition
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Term
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Definition
| the amount of electrical resistance that exists in an electrical circuit when one amp of current is flowing with one volt being applied to the circuit |
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Term
State one example when resistance is desirable.
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Definition
| Electric heater or a light bulb |
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Term
| What components are placed in an electrical circuit to control the amount of resistance in circuit? |
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Definition
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Term
In 1827, George Ohm developed a mathematical relationship between voltage, current, and
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Definition
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Term
State Ohm’s Law in a mathematical equation.
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Definition
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Term
b. What do the following variables represent?
I
V
R
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Definition
I = Current
V = Voltage
R = Resistance |
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Term
Using the equation, I = V / R, describe the following:
If the voltage is increased what will happen to the current?
If the resistance is increased what will happen to the current?
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Definition
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Term
Using the second equation, V = I • R, describe the following:
If either the current or the resistance is increased in the circuit, what will happen to the
voltage?
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Definition
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Term
Using the third equation, R = V / I, describe the following:
If the voltage is increased what will happen to the resistance?
If the current is increased what will happen to the resistance?
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Definition
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Term
| 8. What is the symbol of an ohm? |
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Definition
| Horseshoe, Greek Omega (Ω) |
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Term
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Definition
| The electrons must have a voltage source to create their movement and they need a path in which to travel. This path must be complete from the EMF source, through the other components and then back to the EMF source |
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Term
Explain the relationship of potential and kinetic energy to electricity. |
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Definition
| The potential energy is the “fuel” used to create the electrical energy and the kinetic energy is the movement of the electrons when that “fuel” is converted. Potential is the stored energy and kinetic if the energy being used |
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Term
Describe the battery’s positive terminal.
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Definition
| The long bar of the battery symbol |
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Term
| Describe the battery’s negative terminal. |
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Definition
| The short bar of the battery symbol |
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Term
Describe a series circuit.
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Definition
A series circuit is one where there is only one path for the electrons to take between
any two points |
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Term
What is a load in a circuit?
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Definition
| Anything that uses the energy delivered by the electric current in a circuit |
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Term
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Definition
When there are no resistors or devices to slow the current flow down, this can cause
damage to components or wires |
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Term
What is used in an electrical circuit to prevent a short circuit? |
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Definition
Fuses and circuit breakers |
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Term
Describe a parallel circuit.
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Definition
| In a parallel circuit the electricity has several paths that it can travel |
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Term
How is the ammeter always placed in a circuit?
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Definition
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Term
How is the voltmeter always placed in a circuit? |
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Definition
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Term
What does DC mean in terms of electrical current?
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Definition
The current only flows in one direction
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Term
What do we use every day in our electronic devices that is a good source of direct current?
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Definition
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Term
What does AC mean in terms of electrical current?
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Definition
AC means that the current is constantly being
reversed back and forth |
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Term
How often is the current alternating directions?
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Definition
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