GENERATING AND USING ELECTRICITY
What is a circuit breaker?
A circuit breaker is a safety device that is placed in a series with other circuits that lead to appliances and other outlets.
What is a dry cell?
A cell that contains an electrolyte that is a paste.
What is Electricity?
A form of energy that results from the interaction of charged particles such as electrons or protons.
Define Ground
an object that can supply a very large number of electrons to, or can remove a very large number of electrons from a charged object, thus neutralizing the object.
What is the difference between direct current and alternating current?
A direct current travels through one direction and alternating current can move back and forth in a current.
Is lead-acid a wet or dry cell.
Lead-acid is a wet cell.
Explain Static Electricity.
Static electricity is the electric charge that tends to stay on the surface of an object rather than flowing away.
Define Lightning rod
A metal sphere or point, attached to the highest part of a building and connect to the ground.
What is the PURPOSE of a surge protector?
A surge protector prevents damage to circuits in electronic devices during power surges caused by lightning.
What is an Electrolyte?
An electrolyte is a solution or pastes that conducts a charge.
How do static charges form?
Static charges form when different materials rub together.
Define WIND ENERGY and SOLAR ENERGY
Wind Energy- many large wind turbines at one location.
Solar energy- energy that is directly converted from the sun into electricity.
Explain the difference between renewable energy and non-renewable energy. Give examples of both
Renewable energy can be used more than once. (Wind) Non-renewable energy can only be used once. (Coal)
What is the formula for the potential difference?
V=IR
What is the highest rating on the electrostatic series, which is the lowest rating on the electrostatic series?
(Highest) Ebonite
(Lowest) Glass
Define OPEN CIRCUIT and COULOMB
Open circuit - a circuit that contains a gab or break.
Coulomb - the quantity of charge that is equal to the charge of 6.25 x 1018electrons.
Why can a bird sit on powerlines but a human cannot?
When birds sit on electrical powerlines the electrical current takes the path with least resistance so it ignores the bird and continues to flow through the copper wire. This is because birds are poor conductors.
Why do D cell batteries last the longest?
The D cell lasts the longest because it contains the most electrolyte material.
What charges repel, what charges attract.
Like charges repel.
Opposite and charged and neutral charges attract.
Define RESISTOR, LOAD, and VOLT
Resistor- a device that used in an electrical circuit to decrease the current through a component by a specific amount.
Load- A resistor or any other device that transforms electrical energy into heat, motion sound, or heat.
Volt- The unit for potential difference equivalent to 1 joule per coulomb