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Physics > Physics Major > Flashcards

Physics Major Flashcards

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0
Q

What is resistance measured in?

A

Ohms

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1
Q

Resistance

A

Measure of the DIFFICULTY the charges have in moving through a circuit.

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2
Q

Factors which affect resistance

A

Length
Substance
Temp
Thickness

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3
Q

High resistance - _______ current

A

Low

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4
Q

Low resistance - ________ current

A

High

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5
Q

As the length of the wire increase, resistance _____

A

Increases

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6
Q

As the thickness increases, the resistance _______

A

Decreases

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7
Q

Highest resistance wife

A

Nichrome

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8
Q

Lowest resistance wire

A

Gold

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9
Q

As the temperature increases, the resistance ?

A

Increases

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10
Q

Conditions for wire to have small resistance

A

Short, thick, gold, cold

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11
Q

Wire to have high resistance

A

Long, thin, nichrome, hot

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12
Q

Advantage of parallel circuits

A

Independent control of lights ( if one breaks, others still function)

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13
Q

Advantages of series circuits

A

Cheaper

Energy efficient

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14
Q

Eg of series lights

A

Christmas lights

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15
Q

Eg of parallel lights

A

House lights

Car lights

16
Q

Total resistance of resistors in series

A

All resistance added up

17
Q

Total resistance of Parallel resistors

A

Total resistance is less than the resistance of the lowest resistor

18
Q

Types of energy

A 
Electrical energy
Kinetic
Heat 
Light
Sound
19
Q

Conditions of electrocution

A

Touching two conductors

Different electrical potentials

20
Q

Active wire

A

Wire that carries electricity to the house and different parts of the house

21
Q

Neutral wire

A

Carrys back 0v of electricity to the power station to complete circuit

22
Q

Double insulation

A

Each wire has two layers of insulation around it

23
Q

When is two pin plug used

A

Use of appliances with insulating cases

24
Q

When is three pin plug used

A

Appliances with metal casings

25
Q

Color of active wire

A

Red or brown

26
Q

Color of neutral wire

A

Blue or black

27
Q

Color of earth wire

A

Green or yellow

28
Q

Fuse

A

Breaks a circuit by melting when a large current passed through it

29
Q

Circuit breaker

A

Excessive current trips the switch and break circuit

30
Q

Earth wire

A

Low resistance wire that connects metal frames of electrical appliances to the ground

31
Q

Safety switch

A

When a large difference in current us detected flowing through the active and current wire, the switch breaks so person isn’t electrocuted

32
Q

Cost of electricity can be ccated by

A

Cost = power x time x 30 cents

33
Q

1kw = W

A

1000 w

34
Q

What happens when too much current flows in an elect magnetic circuit breaker

A

Cool creates a large magnetic fis which attracts the iron and breaks circuit

Physics (5 decks)

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