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Gcse Physics > Topic2 > Flashcards

Topic2 Flashcards

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1
Q

What is Current?

A

It is the Flow of charge

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2
Q

What is the Unit for Current?

A

Amps (A)

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3
Q

What do we use to measure Current?

A

Ammeter

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4
Q

In a series is circuit what is the current?

A

The current is the same all the way around.

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5
Q

Ammeter are always connected to what type of circuit?

A

Series circuit

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6
Q

Voltmeters are always connected to what type of circuit?

A

Parallel circuits

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7
Q

In a parallel circuit what is the current?

A

Total current equal to sum of currents through each branch.

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8
Q

What is the Potential difference in a series circuit?

A

Shared between components

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9
Q

What is the potential difference in a Parallel circuit?

A

Equal across each branch

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10
Q

What is the Total resistance of a series circuit?

A

Sum of resistances of each component

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11
Q

What is the Total resistance of a Parallel circuit?

A

Less than resistance of each resistor.

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12
Q

How do you find the out the Charge flow of a circuit?

A

Q(Coulombs, C)=I(Current)/time(s)

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13
Q

What is the equation of Potential difference?

A

V=I(Current, Amps) x R(Resistance)

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14
Q

What are the 3 I-V characteristics graphs?

A

Ohmic conductor, Filament lamp and Diode

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15
Q

What is Resistance?

A

Anything that slows the flow down.

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16
Q

What is Resistance measured in?

A

ohms

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17
Q

What is Potential difference?

A

It is the driving force that pushes the charge around

18
Q

Does the resistance of a ohmic conductor change with the current?

A

No

19
Q

Does the resistance of a Fliament lamp and Diode change with the current?

A

yes

20
Q

What is a LDR?

A

It is a resistor that is dependent on the intensity of light

21
Q

In bright light what happens with the LDR resistance?

A

The resistance falls

22
Q

In darkness what happens with the LDR resistance?

A

The resistance is highest

23
Q

What are light Dependent resistors used for?

A

Automatic night lights

24
Q

What is a Thermistor ?

A

it is a temperature dependent resistor

25
Q

In hot conditions what happens with the resistance?

A

the resistance drops

26
Q

In cool conditions what happens with the resistance?

A

The resistance goes up

27
Q

What are Thermistor used for?

A

Temperature detectors

28
Q

What does adding a resistor in a Parallel circuit do to the total resistance?

A

It reduces the total resistance

29
Q

What are mains in the UK?

A

Alternating current (AC)

30
Q

What does Alternating current mean?

A

The current is constantly changing direction

31
Q

What is the frequency of Alternating current in the UK?

A

50Hz

32
Q

What is the potential difference of alternating current?

A

230v

33
Q

What do Cells and Batteries supply?

A

DC

34
Q

What is the Brown wire?

A

It is the live wire and it carries alternating potential difference from the mains supply

35
Q

What is the blue wire?

A

It is the neutral wire which completes the circuit, the potential difference of this wire is 0V.

36
Q

What is the Green and Yellow?

A

The earth wire it is a safety wire to stop the appliance from becoming live.

37
Q

What is the equation for Power for appliances?

A

P=E/T

38
Q

What is another equation for power of an appliance

A

power=Voltage x Current

P=VI

39
Q

How do you find the power if you don’t know the potential difference?

A

P=I2 X R

40
Q

What is an equation for energy transferred?

A

E=QV

Q= Charge flow(C)

Gcse Physics (9 decks)

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