M4-C9

Question 1

volt

Answer 1

the p.d across a component when 1J of energy is transferred per unit charge passing through the component.

Question 2

e.m.f

Answer 2

when work is done on the charge carriers

Question 3

electron gun

Answer 3

small metal filament is heated by an electric current.if they have gained enough kinetic energy they cans be go through thermionic emission.

Question 4

work done on electron=

Answer 4

1/2 mv^2

Question 5

resistance

Answer 5

p.d/current

Question 6

Ohm’s law

Answer 6

current and p.d are directly proportionate

Question 7

resistor IV graph

Answer 7

obeys Ohm’s law
ohmic conductor
resistance is constant
behaves the same no matter the polarity

Question 8

filament lamp IV graph

Answer 8

non-ohmic conductor
does not obey Ohm’s law
resistance is not constant
behaves the same no matter the polarity

Question 9

diode IV graph

Answer 9

does not obey Ohm’s law
resistance is not constant
behaviour depends on polarity

Question 10

resistivity

Answer 10

resistance multiplied by cross sectional area divided by length

Question 11

LDR

Answer 11

resistance decreases as light intensity increases

Question 12

thermistor

Answer 12

resistance decreases as temperature increases

Question 13

thermistor Iv graph

Answer 13

same shape as filament lamp

Question 14

kilowatt-hour (kWh)

Answer 14

the energy transferred by a device with a power pf 1kW operating for 1 hour
energy equivalent to 3.6MJ