Energy, Power and Resistance

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Potential Difference
Defined as the energy transferred from electrical energy to other forms (heat, light etc.) per unit charge.
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Volt
The derived SI unit of potential difference and electromotive force, symbol V, defined as energy transferred per unit charge, whether energy is transferred to or from the charges. 1V= p.d. across a component when 1J transferred per 1C passes through.
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Electromotive Force
The work done on the charge carriers per unit charge, symbol V, unit volt V, measured across a cell, battery or power supply.
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Electron Gun
A device that uses a large accelerating potential difference to produce a narrow beam of electrons.
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Thermonic Emission
The emission of electrons from the surface of a hot metal wire.
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Resistor
An electrical component that obeys Ohm's law, transferring electrical energy to thermal energy.
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Resistance
A property of a component calculated by dividing the potential difference across it by the current in it, symbol R, unit ohm.
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Ohm
The derived SI unit of resistance, symbol ohm, defined as the resistance of a component that has a p.d. of 1V per A.
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Ohm's Law
The potential difference across a conductor is directly proportional to the current in the component as long as its temperature remains constant.
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Diode
A semiconductor component that allows current only in one particular direction.
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Light Emitting Diode (LED)
A type of diode that emits light when it conducts electricity.
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Threshold Voltage
The minimum p.d. at which a diode begins to conduct.
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Resistivity
A property of a material, measured in ohm metres, defined as the product of the resistance of a component made of the material and its cross-sectional area divided by its length.
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Negative Temperature Coefficient (NTC)
A relationship in which the variable decreases as the tempreature increases, e.g. the resistance of NTC thermistors.
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Thermistor
An electrical component that has a resistance that decreases as the temperature increases (NTC).
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Power
The rate of work done, measured in watts, W.
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Other cards in this set

Card 2

Front

The derived SI unit of potential difference and electromotive force, symbol V, defined as energy transferred per unit charge, whether energy is transferred to or from the charges. 1V= p.d. across a component when 1J transferred per 1C passes through.

Back

Volt

Card 3

Front

The work done on the charge carriers per unit charge, symbol V, unit volt V, measured across a cell, battery or power supply.

Back

Preview of the back of card 3

Card 4

Front

A device that uses a large accelerating potential difference to produce a narrow beam of electrons.

Back

Preview of the back of card 4

Card 5

Front

The emission of electrons from the surface of a hot metal wire.

Back

Preview of the back of card 5
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