Topic 10 - Electricity And Circuits Flashcards Preview

GCSE PHYSICS > Topic 10 - Electricity And Circuits > Flashcards

Flashcards in Topic 10 - Electricity And Circuits Deck (44):
1

What's the equation for energy transferred

Charge moved X volts

2

What's the equation for charge moved

Current X time

3

Define electrical current

The flow of electrons around a circuit

4

Why does the resistance in parallel circuits decrease as more resistors are added

If the current increases but then potential doesn't then the resistance decreases

5

How does resistance work as more resistors are added in series circuits and why

The resistance adds together because they are all connected in one circuit

6

What's the equation for volts

Current X resistance

7

Define a series circuit

Components in series are all connected along one path

8

Define parallel circuits

Components in parallel circuits are connected along multiple paths

9

What's the problem with lamps in series circuits

If one breaks then they all break so it's hard to find the problem

10

What's good about lamps in parallel circuits

If one lamp breaks the others still work so it's easy to find the problem

11

What happens with the voltage in series circuits

It's shared between the components

12

What happens with voltage in parallel circuits

Each component has the maximum voltage

13

What do ameters read when placed around a series circuit

The same current

14

What do ameters read when placed around parallel circuits

A different current

15

Where should voltmeters be placed in a circuit

Voltmeters must be placed Parallel to the circuit

16

What does an ameter measure

Current

17

What does a voltmeter measure

Volts

18

What's the equation for energy transfer

Current X volts X time

19

What's the equation for power

P = work done ÷ time taken

20

What are the two equations for electrical power

Power = current X volts
Power = current^2 X resistance

21

Do batteries and cells produce AC or DC current

DC current

22

Does a domestic circuit carry DC or AC current

AC current

23

What's the frequency and potential difference of a UK domestic circuit

50Hz and 230V

24

What's the brown wire

Live wire

25

How many volts does the live wire carry

230V

26

What is the brown wire connected to in a plug

The fuse

27

What is the blue wire

The neutral wire

28

How many volts does the neutral wire carry

0V

29

What's the job of the neutral wire

To complete the circuit

30

What's the green and yellow wire

The earth wire

31

What's the job of the earth wire

To earth the P.D if the live wire touches a metal casing

32

Where is the earth wire connected at both ends

To the metal casing of an appliance and to the earth by a metal rod

33

What are metals made out of and why

Copper because it's a good conductor

34

What are wires insulated with and why

Plastic because it's a poor conductor so a good insulator

35

What is a fuse

An electromagnet which breaks when the potential difference exceeds the safe level

36

What's the image of a diode

A play button in a circle

37

What's good about diodes and led's and why

They can control the flow of current in a circuit because they have a high resistant back flow

38

What are LED's used in (2 things)

Flash on cameras
Lights

39

How do LED's work

Emmit light when a current passes through it

40

Are LED's a efficient source of light energy

Yes

41

Give 2 details about a filiment lamps build

Thin wire that is tightly coiled

42

How do filiment lamps work

Wire glows when a current flows through it

43

Are filiment lamps an ohmic conductor

No

44

What's the relationship between filiment lamps and current on a graph

It's not directly proportional