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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Q

A

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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Q

A

Fuse

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Q

A

Lamp

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Q

A

Ammeter

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Q

A

Voltmeter

Q

A

Fixed resistor

Q

A

LED

Light Emitting Diode

Q

A

Relay

Q

A

Loudspeaker

Q

A

Microphone

Q

A

Earth/Ground

Q

A

Electric bell

Q

A

Transformer

Q

A

Motor

Q

A

Generator

Q

A

Heater

Q

What do light emitting diodes do

A

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

Q

Uses of light emitting diodes

A

Digital clocks

Traffic lights

Digital clocks

Q

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

A

Filament

Q

What does an LDR do

A

Changes resistance depending on how much light falls on it

Q

In _________ light, the resistance of an LDR falls, and in ______________, the resistance is ____________

A

Bright

Darkness

Highest

Q

Where is an LDR useful

A

Burglar detectors

Q

A thermistor is a _______________-dependant resistor

A

Temperature

Q

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

A

Down

Up