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41 Cards in this Set
- Front
- Back
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What is an electric charge at rest; generally produced by friction or induction?
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static electricity
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What is the space around a charged object in which another charged object experiences an electric force?
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electric field
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What is the force of attraction or repulsion on a charged particle that is due to an electric field?
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electric force
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What is the law that states "like charges repel and opposite charges attract"?
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The Law of Electric Charges
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What is the material in which charges can move freely?
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conductors
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What is the material in which charges cannot move freely?
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insulator
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Give examples of conductors and insulators?
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conductors-copper, aluminum, mercury
insulator-plastic, rubber, glass, wood, air |
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What is the release of electricity stored in a source?
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electric discharge
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What occurs in an object in order for it to become charged?
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atom loses or gains electrons
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What is it when electrons are "wiped" from one object onto another?
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friction
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What is it when charges in an uncharged metal object are rearranged w/o direct contact?
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induction
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What is it when electrons move from one object to another by direct contact w/ a charged object?
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conduction
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What is it when no charges are created or destroyed; just their location changes?
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conserve
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What are tiny particles that make up matter?
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atoms
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How are atoms connected to electricity?
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-by electrons and protons
-when electrons move an imbalance occurs |
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What could u use to see if something had a charge?
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electroscope
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What is it when an object is providing a path for electric charges to move to Earth?
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grounding
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What is the flow of charges?
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electric current
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When can an electric current be created?
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electric field causes electrons to move in a circuit
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What is the unit that expresses current?
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Amperes (Amps)
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What kind of current is it when charges shift from one direction, to the reverse, and back?
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alternating current
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What kind of current is it when charges flow in one direction only?
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direct current
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What is the potential difference between 2 points in a circuit?
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voltage
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The greater the voltage, the greater the ___________ is.
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current
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What do most household eletrical outlets in the U.S. usually supply a voltage of?
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120
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What is the opposition to electric flow called?
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resistance
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What units is resistance measured in?
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Ohms
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What factors affect the resistance of a wire?
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-material
-thickness -length -temperature |
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What is the device that changes chemical or radiant energy into electrical?
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cell
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Describe the difference between a wet cell and a dry cell?
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wet cell-liquid electrolyte
dry cell-paste like or solid electrolyte |
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What are the parts of an electric cell and what does each part do?
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electrolyte-mixture of chemicals in a cell
-allow charges to flow electrode-conducts material in a cell -allow charges to enter and leave cell |
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What is a device that converts light energy into electrical energy?
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photocell
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What is a thermocouple able to do?
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convert thermal (heat) energy into electrical
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Where might u find a thermocouple?
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car engine, furnace, oven
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What has very little, nearly no resistance, and is very cold?
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superconductor
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Where are superconductors used?
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MRI, generators
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What is the unit used to measure resistance to electricity's flow?
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Ohm
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What does an increase in resistance do to the current if the voltage stays the same?
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it decrease it
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What is the rate at which electrical energy is converted into other forms of energy?
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electric power
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How is electrical energy usage measured?
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E=p.t
often- E=kw.hr |
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What are some ways to save energy?
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-turn off lights if not in use
-use fans -don't leave water running |
