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physics > chapter 4 > Flashcards

chapter 4 Flashcards

1
Q

what is electric current

A

the flow of electrical charge

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2
Q

what is potential differnce/voltage

A

the driving force that pushes the charge round

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3
Q

what does Q=IT mean

A

charge=current*time

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4
Q

whats the formula that links potential differnce and current

A

potential
differnce(v)=current(A)*resitsance(ohms)

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5
Q

what do ohmic conductors have

A

a constant resitance

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6
Q

whats not an ohmic conductor

A

diode and a filiment lamp

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7
Q

explain the IV graph of an ohmic conductor

A

The current is directly proportional to to potential differnce so you get a straight line

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8
Q

explain the IV graph of a filament lamp

A

as the current increases the temprrature of the filamnet increases, so the resistance increases. This means that less current can flow cauasing the graph to curve.

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9
Q

explain the IV graph of a diode

A

current will only flow through a diode in one direction beacuse it has a very hight resistance in the reverse direction.

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10
Q

what is LDR short for

A

light dependent resitsor

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11
Q

what happens to a LDR in bright light

A

the resistance falls

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12
Q

what happens to a LDR in darkeness

A

the resistance is the highest

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13
Q

what is a thermistor

A

a temperatur dependent resistor

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14
Q

what happens to a LDR in hot conditions

A

the resistance drops

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15
Q

what happens to a LDR in cool conditions

A

the resistance goes up

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16
Q

in a series circuit what happens to potential differnce

A

its sharred

17
Q

how do you work out voltage in a series circuit

A

you add up all the volt meters

18
Q

in a series circuit what happens to current

A

its the same everywhere

19
Q

in a series circuit how do you work out resistance

A

add up all the resistors

20
Q

in a parallel circuit what happens to potential difference

A

its the same across all components

21
Q

in a parallel circuit what happens to current

A

its shared

22
Q

what happens if you add a resistor to a parallep circuit

A

the resitance goes down

physics (21 decks)

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