Electricity Symbols And Graphs (10) Flashcards by Henry Russell

Q

Voltage-current graph for a metal filament lamp

A

As the temperature of the metal filament increases, the resistance increases, hence the curve

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Q

Voltage-current graph for a diode

A

Current will only flow through a diode in one direction, as shown

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Q

Voltage-current graph for a wire

A

The current through a wire (at constant temperature) is proportional to voltage

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Q

Voltage-current graph for a resistor

A

The current through a resistor (at constant temperature) is proportional to voltage-current is proportional to voltage. DIfferent resitors however, have different resistance, therefore slopes may have different gradients to this. However they will always be straight

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Q

A

Cell

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Q

A

Battery

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Q

A

Switch open

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Switch closed

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Q

A

Diode

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Q

A

Variable resistor

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Q

A

LDR

Light Dependant Resistor

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Q

A

Thermistor

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Fuse

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Lamp

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Ammeter

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Q

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Voltmeter

Q

A

Fixed resistor

Q

A

LED

Light Emitting Diode

Q

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Relay

Q

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Loudspeaker

Q

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Microphone

Q

A

Earth/Ground

Q

A

Electric bell

Q

A

Transformer

Motor

Generator

Heater

What do light emitting diodes do

Emit light when a current flows through them in a forward direction.

Uses of light emitting diodes

Digital clocks Traffic lights Digital clocks

Unlike a light bulb, LED's don't have a ___________ that can burn out

Filament

What does an LDR do

Changes resistance depending on how much light falls on it

In _________ light, the resistance of an LDR falls, and in \_\_\_\_\_\_\_\_\_\_\_\_\_\_, the resistance is \_\_\_\_\_\_\_\_\_\_\_\_

Bright Darkness Highest

Where is an LDR useful

Burglar detectors

A thermistor is a \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_-dependant resistor

Temperature

In hot conditions, the resistance of a thermistor goes _________ and in cool conditions, the resistance goes \_\_\_\_\_\_\_

Down Up