E,W&P 2 Flashcards

1
Q
A
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2
Q

FREQUENCY (f)

A

number of oscillations per unit time (Hz)

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3
Q

FUNDAMENTAL FREQUENCY

A

lowest frequency in a harmonic series where a stationary wave forms

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4
Q

FUSE

A

electrical component designed to break circuit and stop current when a specified amount of current passes through it (safety device)

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5
Q

GPS

A

global positioning system, network of satellites used to determine an objects position on the Earth’s surface, used in navigation

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6
Q

HARMONICS

A

whole number multiplesof the fundamental frequency of a stationary wave

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7
Q

INSULATOR

A

material with a small number density of conduction electrons and a very high resistance

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8
Q

INTENSITY

A

energy incident per square metre of a surface per second (Wm-2)

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9
Q

INTERFERENCE

A

addition of two or more waves that results in a new wave pattern (superposition)

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10
Q

INTERNAL RESISTANCE (r)

A

resistance of a better or cell (ohms)

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11
Q

JOULE

A

unit of energy 1J = work done to move 1N 1m in direction of the force

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12
Q

KELVIN

A

SI of temperature (K)

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13
Q

KILOWATT

A

unit of power (Kw)

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14
Q

KILOWATT- HOUR

A

3 600 000 J

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15
Q

KIRCHOFF’S 1ST LAW

A

the sum of the currents entering any junction is always equal to the sum of the currents leaving the junctions

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16
Q

KIRCHOFF’S 2ND LAW

A

the sum of the e.m.f’s is equal to the sum of the p.d’s in a closed loop

17
Q

LDR

A

light dependant resistor- component that changes its resistance with changes in light intensity dark= high resistance, light = low resistance

18
Q

LED

A

light emitting diode, only allows electric current to pass through it in one direction &emits light when a p.d is applied across it

19
Q

LINE SPECTRUM

A

spectrum produced by a material that contrains only certain frequencies due to electron transitions between energy levels

20
Q

LONGITUDINAL WAVE

A

a wave where oscillations are parallel to the direction of wave propagation

21
Q

MONOCHROMATIC LIGHT

A

light maves with a single frequency/wavelength

22
Q

NODE

A

point tha talways has zero amplitude along a stationary wave due to destructive interference

24
Q

OHM’S LAW

A

the electric current through a conductor is proportional to the p.d across it, provided physical conditions remain constant

25
PHASE DIFFERENCE
the differenceby which one wave leads or lags behing another (radians(rad))
26
PHOTOCELL
component that reduces its resistance when light shines on it due to the photoelectric emission of electrons
27