Flashcards in definitions Deck (20):
Allows electrons to flow
Controls the circuit
Uses the electrical energy
Provides electrical potential energy
cells in series
Cells in series:
-Connects cells on top of one another (+ to -)
-One path for electricity to flow.
-Electrical potential increases.
-A light bulb will burn twice as brightly.
cells in parallel
Cells in parallel:
-Connected cells side by side.
-Positive terminals connected together and negative terminals connected together.
-Electric potential remains the same, but with twice as much electric charge, allowing it will operate for twice as long.
a measure of the amount of electric charge that passes by a point in an electric circuit each second.
potential difference (voltage drop)
the electric potential energy that an electron possesses.
Capability of an object to do work.
a measure of how much work or energy is conserved in a process.
have essentially an endless supply, such as solar energy, wind energy and geothermal pressure, while other resources are considered renewable even though some time or effort must go into their renewal, such as wood, oxygen, leather and fish.
Non renewable resources
a resource of economic value that cannot be readily replaced by natural means on a level equal to its consumption. Most fossil fuels, such as oil, natural gas and coal are considered nonrenewable resources in that their use is not sustainable because their formation takes billions of years.
when electrons gather on the surface of an object and move randomly in all directions. Unpredictable nature makes this form difficult to use sometimes.
refers to electric charges (electrons) that flow through a conductor wire in a controlled way on a predictable path (the circuit).
Silver has the least resistance but is very expensive to use in wires. Most conducting wires are made from copper.
As the temperature of the wire increases, its resistance increases and its conductivity decreases. A colder wire is less resistant than a warmer wire.
Longer wires offer more resistance than shorter wires. If the wire doubles in length, it also doubles in resistance.
Wider wires often offer less resistance than thinner wires.If the wire doubles in width, its resistance is a half as great. Conducting wires that carry large currents need large diameter to lessen their resistance.
A current flowing one way, then another, back and forth, very quickly.