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Physics > Y11 Mock Electricity > Flashcards

Y11 Mock Electricity Flashcards

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1
Q

what is needed for electrical charge to flow through a closed circuit

A

for electrical charge to flow through a closed ciricit the circuit must include a source of potential difference

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2
Q

what is electrical current

A

a flow of electrical charge. the size of the electric current is the rate of flow of electrical charge

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3
Q

what does the current through a component depend on

A

the resistance of the component and the potential difference

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4
Q

what is potential difference

A

the push of electrical charge

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5
Q

what is resistance

A

slows down the flow of electricity

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6
Q

resistance practical in series and parallel method

A
  1. construct circuit in series with two resistors, an open switch, a cell, ammeter, voltmeter
  2. switch on power supply and close the switch, record voltage and current shown
  3. construct new circuit by rearranging the resistors from series to parallel
  4. switch on power supply and close the switch. record the voltage and current for this circuit
  5. calculate total resistance of each current using v=I X R
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7
Q

results of resistance in series circuits from practical

A

adding resistors in series increases the total resistance of the circuit

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8
Q

result of resistance of parallel circuits from practical

A

the more resistors you add, the smaller the resistance

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9
Q

difference in resistors

A

for some resistors the R value remains constant and for others it doesn’t and can change as the current does

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10
Q

what does the ohmic conductor graph show

A

current is directly proportional to potential difference
straight line through origin

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11
Q

describe the filament bulb graph

A

as current increases so does temperature so it becomes harder for current to flow
graph becomes less steep

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12
Q

describe diode graph

A

current only flows in one direction
resistance is high in the other direction so no current can flow

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13
Q

resistance practical in a wire method

A
  1. construct circuit you have drawn
  2. set length of wire to 10 cm using croc clip
  3. close switch and measure resistance and record
  4. open switch and increase length of wire to 20 cm
  5. record the new measurement for resistance
  6. continue to do this for every 10cm up to 70cm
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14
Q

what is the result of resistance in a wire practical

A

resistance is directly proportional to length

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15
Q

what is the current like in series circuits

A

same current through each component

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16
Q

potential difference in series circuits

A

total pd of power supply is shared between the components

17
Q

resistance in series circuits

A

resistance will add up to make total resistance

18
Q

current in parallel circuits

A

total current through the whole circuit it the sum of the currents through the separate components

19
Q

potential difference in parallel

A

pd across each component is the same

20
Q

voltage of mains electricity

A

230 v

21
Q

frequency of mains electricity

A

50 Hz

22
Q

what are everyday appliances designed to do

A

bring about energy transfers

23
Q

what does amount of energy an appliance transfers depend on

A

how long the appliance is switched on for, and its power

24
Q

what is AC

A

alternating current , constantly changing direction 230V and 50Hz

25
Q

what is DC

A

direct current , supplied by batteries, flows in one direction

26
Q

features of cables

A

most have 3 wires (live, neutral and earth) , covered in plastic insulation

27
Q

what do cables do

A

transfer to kinetic energy of electrical motors or energy of heating devices

28
Q

what does the national grid do

A

transfers electrical power from power stations to consumers

29
Q

what do step up transformers do

A

increase potential difference from power station to the transmission cables

30
Q

what do step down transformers do

A

decrease potential difference to a lower value for domestic use

31
Q

how do transformers increase efficiency

A

step up transformers increase efficiency by increasing voltage which decreases current so reduces heat loss

Physics (19 decks)

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