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