Chapter 9.3 Flashcards
What is the flow of electrons or other charged particles from one place to another?
Current electricity
What is electricity that flows only in one direction?
Direct current (DC)
What causes electrons to move from one place to another?
Attraction and repulsion
What is electricity that flows first in one direction then reverses to the opposite direction?
Alternating current (AC)
What is the work per unit charge done to move electric charges between different parts of an electric field or between differently charged regions in a conductor?
Voltage
What is the rate of charge “flow”?
Current
What is the SI unit of current?
Ampere
What is the formula for finding the power of an electric current?
P=Energy/time
How do electric companies measure and charge for electricity?
Kilowatt-hour
What are materials through which current doesn’t easily flow?
Insulator
What is a material that is neither a good conductor or insulator?
Semi-conductor
What are materials through which current flows easily?
Conductors
What is the amount a certain object hinders electron flow?
Resistance
What is the SI unit of resistance?
Ohm
What is the heat that is converted from the energy used to overcome resistance?
Joule heat
What is a material that allows current to flow through it with no resistance at all?
Superconductor
What shows the mathematical relationship between voltage, current, and resistance?
Ohm’s law
What is the mathematical formula for Ohm’s law?
Current = voltage/resistance (I=V/R)
What is an electrical device designed to add resistance to a circuit?
Resistor
How does diameter affect the resistance in an object?
Thicker wires have less resistance; thinner wires have more resistance
How does length affect resistance?
The longer a conductor, the more the total resistance because current is hindered more along a longer path
What is the restatement of Ohm’s law that solves for voltage?
V=IR
