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Physics GCSE AQA > Electricity > Flashcards

Electricity Flashcards

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1
Q

What color is the live wire

A

Brown

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2
Q

What color is the neutral wire

A

Blue

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3
Q

What color is the Earth wire

A

Green and yellow stripes

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4
Q

What’s the use of the neutral wire

A

The neutral wire complete the circuit

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5
Q

What’s the use of the live wire

A

The live wire carries the alternating potential difference from the supply

The live wire is a safety wire to stop the appliances becoming live

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6
Q

What is the potential difference between the live wire and the Earth wire

A

230 V

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7
Q

Where is the neutral wire

A

The neutral wire is close to the Earth

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8
Q

What is the use of the Earth wire

A

The Earth where is a safety wire to stop the appliances become in live

The Earth where is at 0V It only carries a current if there is a fault

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9
Q

Means electricity is an AC supply in the United Kingdom has a frequency of what

A

It has a frequency of 50 Hz and is about 230 V

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10
Q

The every day electric Apliances are designed to do what

A

To bring about energy transfers

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11
Q

The amount of energy and appliance transfers depends on what

A

How long the appliance is switched on for and the power of the appliance

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12
Q

How is work done

A

Work is done when charge flows in a circuit

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13
Q

What is the national grid

A

The national grid is a system of cables and transforms linking power stations to consumers

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14
Q

How is that electric power transferred

A

The electric power is transferred from power stations to consumers using the national grid

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15
Q

What are step up transformers used for

A

Step up transformers are used to increase the potential difference from the power station to the transmission cables

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16
Q

What’s the use of step down transformers

A

Step down transformers are used to decrease to a much lower value the potential difference of the domestic use

17
Q

What is the electric current a flow of

A

The electric current is a flow of electrical charge

18
Q

What does the current through a component depend on

A

The resistance (I) of the component and the potential difference (V) across the component

19
Q

The greater the resistance of the component What happens to the current

A

The greater the resistance of the component the smaller the current for a given potential difference (pd) across the component

20
Q

What happens to the resistance of a thermistor when the temperature increases

A

The resistance of a thermistor decreases as the temperature increases

21
Q

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

A

The resistance of an LDR decreases as the light intensity increases

22
Q

What is the use of an LDR

A

It switches lights on when it gets dark 

23
Q

What’s the difference between direct current and alternating current

A

Direct current (DC): the electric charge (current) only flows in one direction

Alternating current (AC): the electrical charge (current) changes directions

24
Q

Describe the difference between series and parallel circuit

A

A series circuit is where resistors are connected together in the same line, however in a parallel circuit resistors are connected in parallel.

25
Q

Explain why adding resistors in a series increases the total resistance while adding resistors in parallel decreases the total resistance?

A

In a parallel circuits the net resistance decreases as more components are at it because there are more paths for the current to pass through. Adding resistors in series always increases the total resistance the current has to pass through each resistor intern so adding an additional resistor adds to the resistance already encountered.

26
Q

Explain the design and use of DC circuits for measurements and testing purposes.

A

A DC circuit is a direct current that is steady constantly flowing in the same direction in a circuit from positive to negative.

27
Q

Define potential difference

A

Potential difference is Voltage

28
Q

Describe a parallel circuit

A

The potential difference across each component is the same or in other words the voltage across each component is the same. The total current of the whole circuit is the sum of the currents through the separate components.

29
Q

What does linear and nonlinear mean

A

A linear circuits is one who’s parameters are constant with time and they do not change with voltage or current, a nonlinear circuit is that circuit who’s parameters change with voltage or current.

30
Q

What is a series circuit

A

In a series circuit the same current flows through each component. The total potential difference of the power supply is shared between the components. The total resistance of each component is the sum of all the components.

31
Q

For an electric charge to flow through a closed circuit what must it include

A

It must include a source of potential difference

32
Q

How do you increase efficiency of intended energy transfer

A

Thermal insulation lubrication and streamlining

33
Q

Describe the main energy source available

A

The main energy sources available are fossil fuels such as coal gas and oil nuclear power biofuel wind power hydroelectricity tidal power and solar power and geothermal power and sun and water and sun and water waves.

34
Q

Why are some energy sources more reliable than others

A

The non-renewable sources are the most reliable as they can be used at any time. However they produce more greenhouse gases.

35
Q

Name some energy sources that are renewable and nonrenewable

A

Sunlight and wind renewable resources
fossil fuels such as coal oil and gas are non-renewable

36
Q

How can you reduce unwanted energy transfers

A

Thermal insulation lubrication and streamlining

37
Q

Where is energy transferred in a closed system

A

In a closed system there is no energy added and no energy can escape the total energy in the system remains the same

Physics GCSE AQA (8 decks)

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