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electricity mk > electricity and magnetism > Flashcards

electricity and magnetism Flashcards

1
Q

3 ways to charge an object

A

friction, induction, conduction

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2
Q

build up of NON moving charge

A

static electricity

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3
Q

potential energy between electrons in a circuit

A

voltage

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4
Q

flow of electrons through a conductor

A

current

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5
Q

opposes electron flow through a wire

A

resistance

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6
Q

the push behind electrons in a circuit

A

voltage

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7
Q

the speed of electrons flowing in a circuit

A

current

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8
Q

the units for voltage

A

Volts

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9
Q

the units for Resistance

A

Ohms (horseshoe symbol)

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10
Q

the units for current

A

Amps or A

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11
Q

the path that eletrons flow

A

circuit

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12
Q

a path where electrons cannot flow

A

open circuit

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13
Q

a path where electonrs CAN flow easily

A

closed circuit

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14
Q

current that flows in only ONE direction

A

DC or direct current (as in a battery)

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15
Q

current that flows in TWO directions

A

AC or alternating current (as in a wall outlet)

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16
Q

device that stores electrical charge

A

capacitor

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17
Q

example of a capacitor

A

camera

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18
Q

fuse

A

metal tab that melts when current gets too high (found in older homes to prevent house fires from bad wiring)

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19
Q

electromagnetic switch that trips when current gets too high

A

circuit breaker (found in newer homes to prevent house fires)

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20
Q

device that resists the flow of electrons

A

resistor (examples radios, light bulbs, etc)

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21
Q

circuits where electrons have only one path, and if one light is broken the whole circuit shuts down

A

series circuit (like Xmas lights if one bulb broke electrons stop flowing)

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22
Q

circuit with more than one path for electrons to flow. If one light is broken electrons can flow through a different part of the circuit back to the battery

A

parallel circuit (like our house, if we blow a fuse upstairs, we can still use lights downstairs)

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23
Q

battery with a LIQUID electrolyte to create electrictiy

A

wet cell (Ex. a car battery)

24
Q

battery with a PASTY electrolyate to create electricity

A

dry cell (Ex. a battery)

25
Q

a combination of two or more cells

A

battery

26
Q

circuit with devices the SHARE voltage (3 bulbs, each gets 1/3 of the voltage in circuit)

A

parallel circuit

27
Q

circuit where devices all have the SAME voltage (3 bulbs all have same voltage)

A

series circuit

28
Q

If there are 3 bulbs in a SERIES circuit what would EACH OF their resistances be?

A

the same resistance

29
Q

If there are 3 bulbs in a PARALLEL circuit what would EACH OF their resistance be?

A

1/3 of the total resistance

30
Q

force of attraction or repulsion due to ARRANGEMENT of electrons

A

magnetism

31
Q

Where is the force the strongest in a magnet

A

at the poles (ends of the magnet)

32
Q

The Earth’s NORTH magnetic pole is actually a SOUTH magnetic pole. True or False

A

True, because the earth’s north magnetic pole attracts the north pole of magnet. Opposite poles attract.

33
Q

North pole of magnet will ATTRACT or REPEL a north pole of another magnet

A

repel (same poles repel)

34
Q

The north pole of a magnent with ATTRACT or REPEL a south pole of another magnet.

A

attract (different pole attract)

35
Q

What direction do magnetic field lines go?

A

from North to South pole

36
Q

Define “DECLINATION”

A

difference in angle between geographic north and magnetic north (true north on a map, vs the north on a compass)

37
Q

Name 3 magnetic metals

A

Iron, Nickel and Cobalt (Fe, Ni, Co)

38
Q

Define “magnetic domains”

A

atoms with parallel magnetic fields (arrows in metal all point the same direction)

39
Q

What does a metal look like if its magnetized?

Think of domains

A

arrows all point same direction

40
Q

What does a metal look like if not magnetized?

A

arrows point in different directions

41
Q

Name 3 ways that metals can lose their magnetism

A

dropping, striking them, heating them

42
Q

In the right hand rule what does the Thumb represent?

A

direction of current

43
Q

In the right hand rule what do the fingers represent?

A

the direction of magnetic field

44
Q

What is a coil of wire with current that produces a magnetic field?

A

solenoid

45
Q

What is a solenoid with an IRON CORE?

A

electromagnet

46
Q

What 4 things determine amount of electromagnetism?

A

amount of current
number of coils of wire
size of core material

47
Q

what is the name of a device that measures current?

A

galvanometer

48
Q

What machine converts moving parts (energy of motion) to electrical energy?

A

generator

49
Q

What device changes voltage and current in a wire from high to low?

A

transformers (reduced voltage from power lines to your house)

50
Q

What type of transformer DECREASES voltage and INCREASES current?

A

step down transformer

51
Q

What type of transformer INCREASED voltage and DECREASES current?

A

step up transformer

52
Q

How do we get most of our electricity in the US?

A

by burning coal

53
Q

How do power plants get energy?

A

with turbines (big fans)

54
Q

What are other sources of energy?

A

water, wind, natural gas, nuclear

55
Q

Who is the best mom in the world?

A

You shouldn’t need to check the answer to that! You know it! Uhh…huhhh.that’s right…uh..huh…

electricity mk (1 decks)

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