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Physics (P.2) > Currents In Electrical Circults > Flashcards

Currents In Electrical Circults Flashcards

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1
Q

What happend to certain insulated materials when they are rubbed togetehr?

A

They become electricaly charwged

negitively chaged electrons are rubbed off one material and onto another

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2
Q

What happens to the insulated material which gains electrons?

A

It becomes negatively changed

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3
Q

What happens to the insualted material which loses electron?

A

It is left with an equal positive charged

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4
Q

What happens when 2 electrically charged objects are brought together?

A

They exert a force on each other

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5
Q

Two objects that carry the same type of charge…

A

Repel

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6
Q

Two objects that carry different charge…

A

Attract

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7
Q

What are electrical charges allowed to do in certain substances, such as metals?

A

They can move easily

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8
Q

What is an elecric current?

A

it is a flow of electric charges

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9
Q

what is the size of the electric current?

A

It is the rate of flow of electric charges

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10
Q

The equation for the size of the current is:
Q
I = — What do these symbos mean?
t

A

I = current in Amps
Q =charge in coulombs
t = time in seconds

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11
Q

The equation for the potential differnce is:
W
V= — What do these symbos mean?
Q

A 
V = pottential difference in volts
W = work done in joules
Q = charge in coulombs
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12
Q

What are current-potential graphs used to show?

A

They are used to show how current through a component varies with the potential difference across it

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13
Q

Who can the resistance of a component be found?

A

by measuring the current through, and potential difference across the resistor

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14
Q

The equation for the resitance is:
V
R = — What do these symbos mean?
I

A 
R = the resistace in ohms
V = pottential difference in volks
I = current in amps
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15
Q

What does the current of a component depend on?

A

It depends on its resistane. the greater the resistanxe the smaller the currenet for a given potantial difference across the comnponent

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16
Q

The potential difference provided by cells connected in series is the sum…

A

of the potential difference of each cell (depending on the direction in which they are connected)

17
Q

For components connected to a series circuit the total tesistance it the sum of…

A

The resistance of each component

18
Q

For components connected to a series circuit, the current is…

A

the same in each component

19
Q

For components connected to a series circuit, the total potential difference to the supply is…

A

shared between the components

20
Q

For components connected to a parallel circuit, the potential differnce across each component is…

A

the same

21
Q

For components connected to a parralel circuit the total current through the whole circuit id the sum of…

A

The current throuhg the seperate components

22
Q

The resistance in a filament bulb …… as the temperature …….

A

increases and increases

decreases and decreases

23
Q

The current through a diode flows in which direction?

A

only one

24
Q

What is the resistant of a diode in the revers direction?

A

very high

25
Q

When does resistance increase?

A

The length of the wire increases

The thickness of the wire decreases

26
Q

How is resistance caused?

A

An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance.

27
Q

Why does the increase of the length of the wire cause as increase in resistance?

A

The resistance of a long wire is greater than the resistance of a short wire because electrons collide with ions more often.

28
Q

Why does a thinner cause a greater resistance?

A

The resistance of a thin wire is greater than the resistance of a thick wire because a thin wire has fewer electrons to carry the current.

29
Q

When does an LED emit light?

A

when a current flows thorugh it in the forwards direction

30
Q

Why is there an increase in the use of LEDs for light?

A

Because they use a much smaller current than other forms of lighting

31
Q

The resistance of a LDR decreases as light intensity…..

A

Increases

32
Q

The resisatance of a thermistor decreases as the temperature…

A

Increase

Physics (P.2) (7 decks)

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