fucking electricity Flashcards

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1
Q

describe current in series

A

the same throughout the whole circuit

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2
Q

describe resistance in series

A

adds up

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3
Q

describe potential difference in a series circuit

A

adds up

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4
Q

describe current in parallel

A

split between branches according to resistance of branch

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5
Q

describe potential difference in a parallel circuit

A

the same everywhere

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6
Q

describe the resistance in parallel

A

always smaller than the smallest value resistor

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7
Q

how do you measure the force of a spring?

A

attach a newtonmeter to the spring and read off the scale

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8
Q

how do you find the acceleration of a moving object?

A

-fix a piece of card of known width to a trolley or other moving object
-let the object pass in front of the light gates
-read from the datalogger the time it took the card to pass in front of each light gate

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9
Q

describe the shape of a I-V resistor/filament bulb graph

A

s shape

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10
Q

describe the shape of a I-V diode graph

A

horizontal for ages, then straight line (maybe 60 degrees)?

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11
Q

describe the shape of a resistance/light intensity LDR graph

A

|
|\
| \
|. \
|. L _ _ _ _ _ _ _
|_____________________

…kinda ( you get what i mean)

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12
Q

describe the shape of a resistance/temperature thermistor graph

A

|
|\
|. \
|. \
| \
|. \
|_______\______________

.but more curved (slightly) ..kinda ( you get what i mean)

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13
Q

define ohm’s law

A

the rule that states that the current flowing through a resistor is directly proportional to the voltage across the resistor, provided the temperature remains constant

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14
Q

describe an alpha particle

A

2 protons and 2 neutrons

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15
Q

describe a beta particle

A

a fast moving, highly charged electron emitted from a nucleus

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16
Q

what happens to an atom during beta decay?

A

a neutron turns into a proton and emits a beta particle

17
Q

describe gamma radiation

A

a type of electromagnetic radiation emitted from an unstable atomic nucleus during radioactive decay

18
Q

define spontaneous

A

cannot be induced

19
Q

define random

A

cannot predict when it will decay

20
Q

describe radioactive decay

A

spontaneous breakdown of unstable atomic nuclei

21
Q

define half-life

A

the time it takes for half of the unstable nuclei in a radioactive sample to decay, or the time it takes for the activity of a radioactive source to halve

22
Q

where is half-life applied in real life?

A

carbon dating and nuclear medicine

23
Q

describe 2 specific medical applications of radiation

A

-cancer treatment - targeted radiation therapy to destroy tumour cells
-sterilisation - gamma radiation to sterilise medical equipment and supplies

24
Q

describe the speed of electromagnetic waves

A

the speed of light

25
Q

what is the speed of light?

A

3*10^8m/s

26
Q

name 2 uses for radio waves

A

-gps
-phone signals

27
Q

name 2 uses for microwaves

A

-microwave ovens
-phone signals

28
Q

name 2 uses for infrared waves

A

-night vision cameras
-building heat loss detection

29
Q

name 2 uses for ultraviolet waves

A

-killing bacteria
-vitamin D production

30
Q

name 2 uses for x-rays

A

-detecting bone fractures
-airport baggage scanning

31
Q

name 2 uses for gamma rays

A

-cancer radiation therapy
-sterilising medical equipment

32
Q

what is the voltage of domestic uk electricity supply?

A

230 volts

33
Q

what are some disadvantages of fission vs fusion

A

-fusion > more energy than fission
-fission produces dangerous waste
-fission can lead to an uncontrolled chain reaction

34
Q

how many neutrons does nuclear fission emit?

A

2 or 3