electricty Flashcards

1
Q

What is an electric current

A

its a flow of charge in a conductor

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2
Q

what is the flow of charge in a metal

A

flow of electrons

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3
Q

which way does a conventional current flow

A

positive to negative

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4
Q

another name for positive terminal

A

surplus

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5
Q

another name for negative terminal

A

deficancy

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6
Q

what is a current

A

amount of charge passing a point in a second

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7
Q

what is the current symbol

A

I

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8
Q

what is current measured in

A

amps

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9
Q

what do you use to measure current

A

ammeter

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10
Q

must the annemter be connected in series or parallel

A

series

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11
Q

how many milliamperes in an ampere

A

1000

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12
Q

what is a cell

A

source of energy in a circuit

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13
Q

what is the amount of energy per unit charge measured in

A

volts

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14
Q

what happens to chemical energy in a battery

A

its converted to electrical energy

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15
Q

what are wet cells

A

source of power that produces energy through a chemical reaction ina solution

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16
Q

what are dry cells

A

source of power that has reactive chemical in a dry paste.

17
Q

true or false: the positive end of a cell is connected to the negative end in series

18
Q

what is the advantage of cells in series

A

you have a higher voltage

19
Q

how are cells joined in a parallel circuit

A

end of positive cells are joined together and end of negative cells are joined together.

20
Q

what is the advantage of having cells connected in parallel

A

lasts longer

21
Q

true of false: the total potential diffrence of cells in parallel is not equal to one of the branches

A

false, it is

22
Q

what is another term for potenial diffrence

23
Q

what is potential difrence

A

amount of energy gained or lost by a unit of charge

24
Q

symbol for voltage

25
what is voltage measured in
volts
26
what do we measure voltage with
voltmeter
27
what does a lightbulb convert energy into
light and heat
28
what are conductors
substance that allow the flow of charge through them
29
do conductors offer some resistance
yes
30
what is resistance measured in?
ohms
31
why is resistance present in a conductor
due to collisions between moving charges and particles
32
what are some factors that affect resistance
length, thickness, type(material), temp
33