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Flashcards in Magnetism Deck (48):
1

Unlike poles...

Attract

2

Same poles...

Repel

3

Direction of field lines

South to North

4

Earth's magnet

S
N

5

The Earth is magnetic therefore what must it contain?

Iron, Nickel or Cobalt (magnetic metals) in the Earth's core.

6

The only magnetic metals

Iron, Nickel and Cobalt

7

Why is the Earth's magnetic field not symmetrical?

Because the sun's solar wind compresses and distorts the field lines.

8

Series Circuit

A circuit that contains just 1 continuous loop.

9

Parallel Circuit

A circuit containing 2 or more loops.

10

Cell (symbol)

---| I---

11

Battery (symbol)

---| | - - I---

12

Lead/wire symbol

-------

13

Filament lamp/bulb symbol

-----(X)-----

14

Ammeter symbol

------(A)------

15

What does an Ammeter measure?

Current

16

Voltmeter symbol

-------(V)-------

17

What does a voltmeter measure?

Volts

18

Resistance Equation

R=V/I
R= Resistance
V= Volts
I= Current

19

Voltage equation

V= RI

20

Current equation

I= V/R

21

Current

The rate of flows of electrons (charge) through a wire/lead/circuit.

22

Units for Current

Ampears/Amps [A]

23

Potential Difference (voltage)

The energy delivered through a circuit to a component per unit charge.

24

Units for potential difference

Volts [V]

25

Resistance

This caused the current to be reduced when resistance is high and is often a consequence of the use of materials being used (e.g. wood has a large resistance, while metals have a low resistance allowing electrons to flow more easily.

26

Units for resistance

Ohms/Ω

27

Electromagnet

Solenoid

28

The more turns of the coil the higher/lower the current

higher

29

What does total energy input equal?

Total energy output

30

Sankey diagram

A diagrammatic illustration of how the energy transfers occur in an appliance. The width of the arrows should be equal on either side of the diagram.

31

Efficiency equation

Useful energy output/Useful energy input x100

32

Uranium

Nuclear fuel

33

What is the main energy supplier?

The sun

34

Renewable energy definition

A resource that can be regrown.

35

Non renewable energy definition

A resource that can't be regrown.

36

Renewable energy examples

Solar, wind, hydroelectric, tidal, wave, geothermal.

37

Non renewable energy examples

Fossil Fuels- Oil, coal, natural Gases.
Nuclear power- uranium 235

38

Fossil Fuels advantages

Reliable, cheap, efficient

39

Fossil Fuels disadvantages

Non renewable, gives of co2, global warming-climate change

40

Nuclear power advantages

No co2 emissions, reliable, low operation costs, only need a small amount to work.

41

Nuclear power disadvantages

Non renewable, gives out radioactive waste, commission and decommission expenses and we need to get them from stable nations.

42

Nuclear power disadvantages

Non renewable, gives out radioactive waste, commission and decommission expenses and we need to get them from stable nations.

43

Wind advantages

Renewable and no co2 produced.

44

Wind disadvantages

Relies on wind, noisy and expensive

45

Solar advantages

Good value for money, renewable and no greenhouse effect.

46

Solar disadvantages

Needs to be southfacing, needs sunlight, doesn't work at night and expensive.

47

What happens when Landstone is stroked in a magnet?

Electricity

48

Energy used equation

Power rating (kw) x time (hours)