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Ch17sr
Ch17
| Question | Answer |
|---|---|
| Law of Electric Charge | like Charges repel and opposite charges attract |
| Electric Force | Force between charged objects |
| Electric Field | a region around a charged particle that can exert a force on another charged particle |
| 3 Ways to “charge it” | Friction, Conduction, Induction |
| Conservation of Charge | no charges are created or destroyed |
| How can a charge be detected | using an electroscope |
| Conductor | material in which charges can move easily, |
| Ex of Conductor | copper, silver, aluminum, mercury |
| Insulator | Material that charges can’t move easily |
| Ex of Insulators | plastic, rubber, glass, wood |
| Static Electricity | Buildup of electric charges on an object |
| Electric discharge | loss of static electricity as charges move off an object |
| Lightning | one of the greatest examples of electric discharge |
| Lightning Rods | Pointed Rod connected to the ground through a wire |
| Grounded | objects in contact with the earth |
| Dangerous places to be In a lightning storm | Beaches, Golf courses |
| Cell | a devise that produces an electric current by converting chemical energy into electrical energy |
| Battery | converts chemical energy to electrical energy and is made of several cells |
| Parts of a battery | electrolyte-a mixture of chemicals that conducts a current, electrode- the part of the cell throug hwhich changes enter or exit |
| Types of Battery Cells | wet cells- have liquid electrolytes, dry cells- dry electrolytes that are solid or pastelike |
| What is the relationship between potential difference & volts | potential difference measured with volts |
| Photocells & examples | the part of a solar panel that converts light into electrical energy |
| Thermocouple | tool used to convert thermal energy into electrical energy |
| Electrical current | electrons moving in a wire and has a continuous flow of charge |
| Two types of electrical current | direct current and alternating current |
| Direct Current | the charge flows in the same direction |
| Alternating Current | the charge switches direction |
| Voltage | the difference in energy per unit charge as a charge moves between two points in the path of a current |
| Resistance | the opposition to the flow of electric charge |
| What is the relationship between resistance & current | current is the flow of electric charge is resistance is the opposition |
| How thickness, length & temperature effect electrical current | the thicker is is the less resistance, the shorter it is the less resistance, the higher the temperature the higher restistance |
| What is Ohm’s Law? | Current (I) Equals (=) Voltage (V)/Resistance (R) |
| Electrical Power Formula | Power (P) Equals (=) Voltage (V) Times (X) Current (I) |
| Watt | the unit used to express power |
| How is household energy measured by the energy company | by the time it is used and the power it needs to opperate |
| Circuit | a complete closed path through which electric charges flow |
| Load | a devise that uses electrical energy to do work |
| What do ALL loads do ? | offer some resistance to electric currents and cause the electrical energy to charge into other forms of energy such as light or kinetic energy |
| Explain the relationship that a switch plays in “opening” or “closing” a circuit. | it basically turns what it is connected to on |
| Series circuit | a circuit in which all parts are connected in a single loop |
| How many paths are in a series circuit? | one |
| Explain what happens if one load in the series circuit is malfunctioning. | then all others fail |
| Parallel circuit | a circuit in which different loads are located on seperate branches |
| Why is this circuit important in the wiring of the lights in a building ? | so all the lights dont cut off at the same time |
| Explain what happens if one load in the circuit is malfunctioning. | just that one is put out |
| Give an example of a parallel circuit in your house. | the row of bathroom lights |
| Explain the causes and dangers of overloading a circuit | it causes the circuit to draw more current, the wire temperature increase, and there could be a fire |
| Explain how a fuse and circuit breakers help with circuit safety in your house and automobile | a fuse melts and makes a gap while a breaker opens up to cool down |
Created by:
samrdude
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