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38 Cards in this Set

  • Front
  • Back
Current
Flow of electrons through wire or any conductor
Voltage
The difference in electrical potential
Voltmeter
Measures voltage
Ohm
Measure of resistance of electricity
Electron
Negatively charged particle that moves around the atom's nucleus
Watt
Measure of electrical power (W)
Parallel Circuit
Curcuit with more than one path for current to flow
Series Circuit
Circuit with one path for current to flow
Electric Power
Rate at which electrical energy is converted to another form of energy (expressed in watts/kilowatts)
Static Electricity
Accumulation of electric charges on an object
Circuit Breaker
Device to protect against current overflow in an electrical circuit
Ampere
Measure of current (A)
Volt
Unit of voltage (V)
Insulator
Material that resists the flow of electrons
Resistance
Tendency for a material to oppose current, which changes electrical energy into other forms
Kilowatt-hour
Unit of electrical energy
Conductor
Material that easily allows electrons to flow
Circuit
A closed path through which electrons can flow
Ohm's Law
Potential Difference = Current * Resistance (V=IR, Volts = Amps * Ohms)
Fuse
Protective device for electrical circuits which melts if too much current flows at once
Short Circuit
A shorter path is made for electrons to flow and bypass the resistor
Ways an Object can Become Charged
Friction, Induction, Conduction
Friction
A force opposing motion between two touching surfaces
Induction
Electrically charging an object/creating an electrical current in it, w/o physically touching it
Conduction
Transfer of energy through matter from particle to particle when two objects are touching
Resistance of Wire Increased By:
Thinner/longer wire, increased temperature, different materials
Ammeter
Measures amperes
Current Decreased:
Decrease voltage, increase resistance
Voltage Decreased:
Decrease resistance, decrease current
Resistance Decreased:
Put resistors in parallel, decrease voltage, decrease current
Two Equations
P=VI, Power= Voltage * Current (Watts= Volts * Amps); E=PT, Energy= Power * Time (kWh= kW * hrs)
Series Circuit Properties
All components go out if 1 does, same current through all components, voltage drops from point to point, total resistance increases as components added
Parallel Circuit Properties
1 component going out doesn't affect others, current on branches varies depending on resistance, voltage same through branches, total resistance decreases as # of branches increases
Electricity
Flow of moving electrons
Dry Cell
A power source that acts as an electron pump & generates electric current by a chemical reaction
Wet Cell
A power source that generates electric current by a chemical reaction
Electroscope
Device that detects electric charges
Current flows from __ to __ voltage.
High: Low