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38 Cards in this Set
- Front
- Back
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Current
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Flow of electrons through wire or any conductor
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Voltage
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The difference in electrical potential
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Voltmeter
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Measures voltage
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Ohm
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Measure of resistance of electricity
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Electron
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Negatively charged particle that moves around the atom's nucleus
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Watt
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Measure of electrical power (W)
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Parallel Circuit
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Curcuit with more than one path for current to flow
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Series Circuit
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Circuit with one path for current to flow
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Electric Power
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Rate at which electrical energy is converted to another form of energy (expressed in watts/kilowatts)
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Static Electricity
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Accumulation of electric charges on an object
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Circuit Breaker
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Device to protect against current overflow in an electrical circuit
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Ampere
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Measure of current (A)
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Volt
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Unit of voltage (V)
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Insulator
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Material that resists the flow of electrons
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Resistance
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Tendency for a material to oppose current, which changes electrical energy into other forms
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Kilowatt-hour
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Unit of electrical energy
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Conductor
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Material that easily allows electrons to flow
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Circuit
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A closed path through which electrons can flow
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Ohm's Law
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Potential Difference = Current * Resistance (V=IR, Volts = Amps * Ohms)
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Fuse
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Protective device for electrical circuits which melts if too much current flows at once
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Short Circuit
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A shorter path is made for electrons to flow and bypass the resistor
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Ways an Object can Become Charged
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Friction, Induction, Conduction
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Friction
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A force opposing motion between two touching surfaces
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Induction
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Electrically charging an object/creating an electrical current in it, w/o physically touching it
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Conduction
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Transfer of energy through matter from particle to particle when two objects are touching
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Resistance of Wire Increased By:
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Thinner/longer wire, increased temperature, different materials
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Ammeter
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Measures amperes
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Current Decreased:
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Decrease voltage, increase resistance
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Voltage Decreased:
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Decrease resistance, decrease current
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Resistance Decreased:
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Put resistors in parallel, decrease voltage, decrease current
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Two Equations
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P=VI, Power= Voltage * Current (Watts= Volts * Amps); E=PT, Energy= Power * Time (kWh= kW * hrs)
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Series Circuit Properties
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All components go out if 1 does, same current through all components, voltage drops from point to point, total resistance increases as components added
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Parallel Circuit Properties
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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
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Electricity
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Flow of moving electrons
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Dry Cell
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A power source that acts as an electron pump & generates electric current by a chemical reaction
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Wet Cell
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A power source that generates electric current by a chemical reaction
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Electroscope
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Device that detects electric charges
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Current flows from __ to __ voltage.
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High: Low
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