# Shared Flashcard Set

## Details

EXAM STUDY TIME, Electric Current
kinda describes itself
15
Physics
07/24/2009

Term
 Electric current.
Definition
 The flow of electric charge.
Term
 Which direction does energy flow?
Definition
 From a high to a low potential.
Term
 What is the flow of charge in metals?
Definition
 electrons.
Term
 What are some voltage sources?
Definition
 Batteries and generators.
Term
 How do voltage sources work?
Definition
 They pull the negative charges away from the positive charges.
Term
 How does current and voltage flow?
Definition
 Current goes through the circuit and voltage goes across the circuit.
Term
 What does current depend on?
Definition
 Voltage and Resistance.
Term
 What does resistance depend on?
Definition
 The conductivity, length, and thickness of the material.
Term
 Ohm's Law.
Definition
 The current in a circuit is directly proportional to the voltage across the circuit and inversely proportional to the resistance.
Term
 What does there have to be for an electric shock to occur?
Definition
 A potential difference, or voltage.
Term
 How does a three prong plug prevent shock?
Definition
 One flat prong is live, one flat prong is neutral, and the round prong goes to the ground.
Term
 DC.
Definition
 Direct current, charges flow in one direction.
Term
 AC.
Definition
 Alternating Current, charges flow in one direction and then the other.
Term
 Electric power.
Definition
 The rate at which energy is used.
Term
 kilowatt-hours
Definition
 The amount of energy used at the rate of one kilowatt in one hour.
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