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Physics > Electricity > Flashcards

Electricity Flashcards

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1
Q

current is measured in…

A

amperes (A)

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2
Q

current calculation when time and charge are involved?

A

current = charge/time
I = Q/t
Q is measured in coulombs (C)
t is measured in seconds (s)
I is measured current

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3
Q

current is measured with a

A

ammeter

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4
Q

potential difference is measured in?

A

volts

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5
Q

calculation of potential difference

A

V = E/Q

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6
Q

what is potential difference measured with?

A

voltmeter

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7
Q

a voltmeter is placed in a parallel or series?

A

parallel

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8
Q

a ammeter is placed in a series or parallel circuit?

A

series

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9
Q

resistance is measured in what?

A

ohms

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10
Q

ohmic conductor

A

resistor at a constant temp

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11
Q

non-ohmic conductor

A

filament lamp

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12
Q

does filament lamp current and temperature decrease or increase

A

increase

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13
Q

what does is mean when electrons and ions vibrate more and collide more mean?

A

increase resistance

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14
Q

how many loops are in a series current?

A

one loop

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15
Q

in a series circuit the potential difference is what?

A

shared across each component

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16
Q

parallel components are connected to the power supply in

A

separate branches

17
Q

the current in a parallel circuit is what?

A

shared

18
Q

the potential difference in a parallel circuit is the…

A

same across every branch

19
Q

hazards of electricity (6)

A

damage insulation
electric shock
fire hazard
overheating cables
melting
damp conditions

20
Q

a fuse is a thin piece of wire which will melt if?

A

current is too high

21
Q

earth wires what so a current can flow?

A

safe route

22
Q

why do earth wires have a low resistance

A

so strong current surges through which break the fuse and disconnect

23
Q

energy is measured in

A

joules

24
Q

power of a component is measured in

A

watt

25
Q

direct currents

A

flow in one direction

26
Q

alternate currents

A

current changes direction

27
Q

charge is measured in

A

coulombs

28
Q

protons have a charge of?

A

+1

29
Q

electrons have a charge of?

A

-1

30
Q

neutrons have a charge of?

A

0

31
Q

electrostatic charge can build up due to friction. the clouds discharge through the air to earth. this results to?

A

lightening

32
Q

damages of electrostatic charges include

A
  • electric shock
  • sparks

Physics (8 decks)

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