E,W&P 2

Question 2

FREQUENCY (f)

Answer 2

number of oscillations per unit time (Hz)

Question 3

FUNDAMENTAL FREQUENCY

Answer 3

lowest frequency in a harmonic series where a stationary wave forms

Question 4

FUSE

Answer 4

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

Question 5

GPS

Answer 5

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

Question 6

HARMONICS

Answer 6

whole number multiplesof the fundamental frequency of a stationary wave

Question 7

INSULATOR

Answer 7

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

Question 8

INTENSITY

Answer 8

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

Question 9

INTERFERENCE

Answer 9

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

Question 10

INTERNAL RESISTANCE (r)

Answer 10

resistance of a better or cell (ohms)

Question 11

JOULE

Answer 11

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

Question 12

KELVIN

Answer 12

SI of temperature (K)

Question 13

KILOWATT

Answer 13

unit of power (Kw)

Question 14

KILOWATT- HOUR

Answer 14

3 600 000 J

Question 15

KIRCHOFF’S 1ST LAW

Answer 15

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

Question 16

KIRCHOFF’S 2ND LAW

Answer 16

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

Question 17

LDR

Answer 17

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

Question 18

LED

Answer 18

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

Question 19

LINE SPECTRUM

Answer 19

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

Question 20

LONGITUDINAL WAVE

Answer 20

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

Question 21

MONOCHROMATIC LIGHT

Answer 21

light maves with a single frequency/wavelength

Question 22

NODE

Answer 22

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

Question 24

OHM’S LAW

Answer 24

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

Question 25

PHASE DIFFERENCE

Answer 25

the differenceby which one wave leads or lags behing another (radians(rad))

Question 26

PHOTOCELL

Answer 26

component that reduces its resistance when light shines on it due to the photoelectric emission of electrons