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Physics > p10 > Flashcards

p10 Flashcards

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1
Q

what is the difference between a series circuit and a parallel circuit?

A

series circuit have one loop the current to flow around, in parallel circuits the junctions that allow the circuit to take different routes

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2
Q

how is a voltmeter connected into a circuit?

A

in parallel

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3
Q

what does a voltmeter measure?

A

potential difference voltage

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4
Q

what is the unit for potential difference?

A

volts

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5
Q

how is an ammeter connected in the circuit

A

in a series

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6
Q

what does an ammeter measure?

A

current

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7
Q

what is electric circuit?

A

The rate of flow of charge

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8
Q

what happens when there is a source of potential difference in the closeted circuit?

A

there will be a current in the circuit

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9
Q

if the resistance in a circuit increases, what happens to the current?

A

it decreases

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10
Q

if the resistance in a circuit decreases, what will happen to the current?

A

increases

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11
Q

how can resistant be changed in a circuit?

A

putting different resistors in a circuit or by using a variable resistor

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12
Q

Why does current decrease when resistors are connected in a series?

A

The password becomes harder for the current to flow through

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13
Q

what happens to the net resistance if two resistors are connected in parallel

A

it decreases

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14
Q

why does current increase when resistors are connected in parallel?

A

there are now more paths for the current

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14
Q

what happens to the resistance of an LDR when light intensity increases

A

it decreases

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15
Q

what happens to the resistance of a transmitter when temperature increases?

A

it decreases

16
Q

what is true when there is an electric current and a resistor

A

there is an energy transfer, which heats the resistor

17
Q

what happens when an electrical current does work against the electrical resistance?

A

electrical energy is dissipated as thermal energy in the surroundings

18
Q

what causes thermal energy in circuits

A

collisions between electrons and the ion in the lattice

19
Q

what is power?

A

The energy transferred per second

20
Q

what is the power transfer in any circuit device related to?

A

The potential difference across it and the current in it

21
Q

what is direct current?

A

movement of charge in One Direction are you?

22
Q

give a source of direct current

A

cells and batteries

23
Q

what is alternating-current?

A

current where movement of charge changes direction

24
Q

what sort of current is the domestic supply in the UK?

A

a. c

25
Q

what is the frequency of the UK domestic electricity supply?

A

50Hz

26
Q

what is the potential difference in the UK domestic electricity supply?

A

abt 230V

27
Q

what is the function of the live wire?

A

connects the appliance to the generators at the power station

28
Q

what is the function of the natural wire

A

it is the return path to the power station

29
Q

what is the function of the Earth wire?

A

for safety

30
Q

what should the potential difference be of the live wire?

A

230v

31
Q

what should the potential difference of the natural be

A

0v

32
Q

What’s the potential difference of the Earth wire be

A

0V

33
Q

To which wire should switches and fuses be connected in a domestic circuit

A

live

34
Q

how fuses work?

A

if the current is too high, the wire inside the fuse will melt breaking the circuit

35
Q

how to circuit breakers work?

A

it detects a change in current and safety switch on the supply

36
Q

what colour is the live wire?

A

brown

37
Q

what colour is the natural wire

A

blue

38
Q

what colour is the Earth wire?

A

yellow and green stripes

Physics (16 decks)

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