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Physics 1 > Brief P2 > Flashcards

Brief P2 Flashcards

1
Q

How draw Circuit symbol fr..

A

-I i-
+ -

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2
Q

How draw lamp

A

Circle with x fr

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3
Q

How draw fuse

A

Rectangle with line thru

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4
Q

How draw diode

A

Play button

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5
Q

How draw resistor

A

Rectangle

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6
Q

How draw thermistor

A

Ugly tick starting from bottom left

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7
Q

How draw variable resistor

A

Actual tik

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8
Q

Draw LDR

A

two ticks coming into a circle with a rectangle inside

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9
Q

Draw LED

A

tick bouncing off
Diode symbol

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10
Q

What is an ohmic conductor and state the conditions required

A

A Conductor for which current and potential difference are directly proportional
Resistance remains constant as current changes
Temperature must be constant

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11
Q

4 components for which resistance is not constant as current changes

A

Lamps
Diodes
Thermistors
LDR

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12
Q

What happens to resistance of a filament lamp as the temperature increases and why
(4 marks)

A

Resistance increases
Ions in metal have more energy so collide more frequently with electrons as they flow through the metal - creating greater resistance to current flow

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13
Q

What is different about current flow through a diode

A

Current flow in one direction
Resistance is very high in the other direction preventing current flow

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14
Q

What is different about current flow through a diode

A

Current flow in one direction
Resistance is very high in the other direction preventing current flow

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15
Q

Two examples of when a thermistor may be used

A

In a thermostat to turn a heater on below a certain temperature
In a freezer to turn on a cooler when the temperature becomes too high

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16
Q

What happens to the resistance of a LDR as light intensity decreases

A

LDR’s resistance increases

17
Q

Give an application for a LDR

A

Street lights often use LDR
When light levels become too low, the light gains sufficient current to turn on

18
Q

Function of brown wire

A

Live
Carries p.d from mains supply to appliance
P.d between life and earth 230V

19
Q

Function of blue wire

A

Neutral
Completes the circuit
0V

20
Q

Function of green and yellow wire

A

Earth
Only carries current if theres a fault
0V

21
Q

What is meant by earthing

A

A safety device means earth wire joins the metal case

Physics 1 (3 decks)

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