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41 Cards in this Set
- Front
- Back
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What is an ammeter?
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a device used to measure the current in a circuit
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What are amperes?
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unit for measuring electric current; very small currents are measured in milliamperes (mA); 1 A= 1000 mA
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What is a battery?
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a combination of electrochemical cells connected together (or a single electrochemical cell) that produces a potential difference
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What is a circuit diagram?
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a drawing using symbols to represent the different components of a circuit
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What is current electricity?
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the continuous flow of charge in a complete circuit
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What is an electric circuit?
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a complete pathway that allows electrons to flow
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What is an electric current?
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the amount of charge passing a point in a conductor every second
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What is an electric load?
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any device that transforms electrical energy into other forms of energy, such as a light bulb, buzzer, heater, and motor
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What is electric potential energy?
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electric energy stored in a battery
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What is electrical resistance?
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the rate of change in electrical energy
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What are electrochemical cells?
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electrodes in electrolytes that convert chemical energy into electrical energy stored in charges; also called batteries
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What are electrodes?
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two terminals in a battery or other electricity source; usually made of two different metals but can be a metal and another material
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What is an electrolyte?
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substance that conducts an electric current; in a dry cell, the electrolyte is a moist paste; in a wet cell the electrolyte is a fluid
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What is energy?
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the ability to do work
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What is kinetic energy?
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energy a moving object has because of its motion; depends on mass and speed of object and the temperature
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What is an ohm?
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the unit of measurement for electrical resistance
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What is an ohmmeter?
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a device that measures resistance
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What is Ohm's law?
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the mathematical relationship comparing voltage (V), current (I), and resistance (R), written as R=V/I
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What is potential difference?
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the amount of electric potential energy per one coulomb of charge at one point in a circuit compared to the potential energy per coulomb of charge at another point in the circuit, also called voltage
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What is potential energy?
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energy stored in an object
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What is resistance?
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the property of any material that slows down the flow of electrons and converts electrical energy into other forms of energy
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What is a resistor?
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an electrical component with a set amount of resistance that slows down current and transforms electrical energy into other forms of energy
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What are terminals?
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the positive and negative end points of a battery
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What is a volt?
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the unit of potential difference; one volt causes a current of one ampere to flow through a conductor with a resistance of one ohm
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What is voltage?
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the amount of electric potential energy per one coulomb of charge at one point in a circuit compared to the potential energy per coulomb of charge at another point in the circuit; also called potential difference
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What is a voltmeter?
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a device that measures the amount of potential difference between two points in an electric circuit
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What is a dry cell?
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the type of battery used in flashlights, watches etc.
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What is a wet cell?
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the type of battery used in cars, motorcycles etc.
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How does a battery work?
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-chemical energy separates positive and negative charges
-terminals = end points at which connections are made -one terminal accumulates extra electrons |
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What is work?
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a force that moves the object through a distance
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Name types of potential energy
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sound, light, electrical, mechanical
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How does current electricity work?
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separating positive and negative charges which involves pushing electrons together
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What is electric potential difference?
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voltage - the amount of EPE per unit of charge at a point in a circuit compared to PE per unit of charge at another point in the circuit
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PE in the battery is due to...
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potential difference (V) and the amount of charge thats been separated
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What do electrochemical cells require?
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-2 different electrodes
-an electrolyte |
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What is an electric load?
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any device that transforms electrical energy into other forms of energy
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What are the 4 circuit components?
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source, conductor, load, switch
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What is the force between electrons?
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repulsion
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What is conventional current?
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the positive to the negative terminal
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What is the relationship between voltage and current?
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voltage is directly proportional with current
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When you decrease resistance...
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-more current can travel
-less energy is lost |
