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Flashcards in Physics Paper 1 GCSE Deck (126)
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1

What is a system?

an object or group of objects

2

How can you calculate kinetic energy?

0.5 x mass x (speed)2

3

How can you calculate amount of elastic potential energy stored in a stretched spring?

0.5 x spring constant x (extension)2

4

How do you calculate gravitational potential energy?

mass x gravitational field strength x heaight

5

How do we calculate change in thermal energy?

mass x specific heat capacity x temperature change

6

What is the specific heat capacity of a substance?

amount of energy required to raise the temperature of one kilogram of the substance by one degree celsius

7

What is power?

rate at which energy is transferred or the rate at which work is done

8

How can you calculate power?

energy transferred/timer
work done/ time

9

What is an energy transfer of 1 joule per second equal to?

power of 1 watt

10

How can energy be used?

transferred usefully, store or disspated

11

What can energy not be?

created or destoyed

12

The higher the thermal conductivity of a material the higher the rate of...

energy transfer by conduction across the material

13

How do we calculate efficiency?

useful output/total input

14

What are the main energy resources available of earth?

fossil fuels (coal, oil and gas)
nuclear fuel
bio fuel
wind
hydroelectricity
sun
water waves
geothermal
tides

15

What is a renewable energy resource?

One that is being replenished as it is used

16

What is a step up transformer used for?

increasing the voltage to several hundred thousand volts
reduce current and reduces energy lost by heating the wires
increase potential diffeence

17

What does a step down transformer do?

Reduce voltage down to several hundred volts to a safe level

18

What does the national grid consist of?

a system of transformers and high voltage cables

19

What is the big problem getting energy to homes?

Energy is always lost in the power cables. The bigger the distance between the power station and the homes the greater energy loss

20

Why do they increase the voltage to a high number in the step up transformer?

less energy is lost in the power cables at high voltage then at low voltages

21

What must a closed circuit include to allow an electrical charge to flow through it?

source of potential difference

22

What is the size of the electric current?

Rate of flow of electrical charge

23

How do you calculate charge flow?

current x time

24

What is the symbol for charge flow?

coulombs

25

What does the current through a component depend on?

resistance of the component and potential difference across the component

26

The greate the resistance....

the smaller the current given potential difference across the component

27

How do you calculate potential difference?

current x resistance

28

The current through an ohmic conductor at a constant temperature is.....

directly proportional to the potential difference across the resistor

29

The resistance of components such as lamps, diodes, thermistors and LDRs is...

not constant

30

The resistance of a filament lamp increases as the temperature of the filament ....

increases