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Physics > Paper 1 circuits > Flashcards

Paper 1 circuits Flashcards

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1
Q

Light Dependant Resistor

A

A component that decreases resistance as light intensity increases.

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2
Q

Thermistor

A

A component that decreases the resistance as temperature increases

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3
Q

Charge

A

The electrons that are always in a wire (whether it is connected up to a cell or not)

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4
Q

Current

A

The flow of electrons in a wire or any conductor that happens when it is connected to a cell in a complete circuit

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5
Q

Voltage

A

The push or pull of electrons in the wire this is provided by the cell and makes the electrons flow

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6
Q

Electrical energy

A

This is carried by the current and is converted to heat and light energy in a bulb

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7
Q

Earthquakes

A

Sudden release of energy in earths crust that creates seismic waves. Seismograph used to measure the movements

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8
Q

Moving charge

A

An electric current is a movement of charge. Electric charges can move through metals because they have delocalised electrons that carry a charge

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9
Q

The size of current is the..

A

Rate of flow of charge

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10
Q

When electrical current flows through a resistor what is electrical energy transferred into

A

Heat energy

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11
Q

What is work done

A

The amount of energy transferred in a circuit depending on the amount of charge carried away, the electrons and the p.d pushing the charge around

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12
Q

What is power

A

The rate at which energy is transformed. Measure in watts

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13
Q

The power of a low voltage lamp

A

As the current increases the power also increases and so does the brightness

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14
Q

What happens when there’s a low resistance

A

The bulb was bright and had a higher current

When high resistance bulb dimmer and low current

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15
Q

What happens when the slider is at one end of the resistor

A

There is maximum resistance, this decreases the flow of charge, decreases the current and the bulb is dimmer

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16
Q

What slider is at opposite end

A

Minimum resistance which increases the flow of charge, increases the current and the bulb is brighter

17
Q

The larger the resistance…

A

The smaller the current

18
Q

Ohms law

A

The current through a resistor at constant temperature is directly proportional to the potential difference across the resistor.

19
Q

Series circuits

A

The current is the same at all points in a series circuit
The total p.d of the cell is shared between the components
The total resistance of components is shared between the components

20
Q

Parallel circuit

A

The total current through the whole circuit is the sum of the currents though the separate components
The p.d across each component is the same

21
Q

How does the length of wire affect the resistance

A

As the length of wire increases so does the resistance. The length of wire and the resistance are directly proportional

22
Q

How does the temperature of a thermistor affect its resistance

A

As the temperature increases, the resistance decreases. At bigger temperature the resistance decreases less for the same rise in temperature (curved graph)

23
Q

How does the intensity of light affect the resistance of an LDR

A

As the light intensity decreases the resistance increases. By doubling the distance it more than doubles the resistance= curved line of best fit

24
Q

Equation for current, charge and time

A

Current (A) = Charge (C)/Time (s)

I=Q/t

25
Q

Equation for Energy, Charge and Potential difference

A

Charge (C) = Energy (J)/ Potential Difference (V)

Q= W/V

26
Q

Equation for power, energy and time

A

Power (W) = Energy (J)/ Time (s)

P=E/t

27
Q

Equation for Power, Potential Difference and current

A 
Potential difference (V) = Power (W)/ Current (A)
V= P/I
28
Q

Equation for Resistance, Potential difference and current

A

Resistance (Ohms)= Potential difference (V) / Current (A)

R=V/I

29
Q

Primary waves

A

First type of shock wave produced, longitudinal, move down into the earth away from epicentre. Can go through solids and liquids.

30
Q

Secondary wave

A

Second type of shock wave produced, longitudinal, can only travel through solid

31
Q

How does an LDR work

A

The resistance increases as the light intensity decreases

32
Q

How does a thermistor work

A

Resistance increases as temperature decreases

33
Q

How does a thermistor work in a circuit

A

The decrease in resistance when the temperature increases will allow a higher current so may turn on air conditioning for example

34
Q

How does an LDR work in a circuit

A

The decrease in resistance when the brightness increases will allow a higher current e.g. closing a blind in bright light

Physics (20 decks)

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