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### 38 Cards in this Set

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 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