resistance of a filament lamp

Question 1

current through a filament lamp is not ______ _______ to potential difference?

Answer 1

current through a filament lamp is not directly proportional to potential difference

Question 2

why is the current in a filament lamp not directly proportional to potential difference?

Answer 2

because the filament lamp gets hot, causing resistance to increase

Question 3

in a filament lamp, resistance ______ as temperature increases?

Answer 3

in a filament lamp, resistance increases as temperature increases

Question 4

current through a diode flows through 1 ______ only?

Answer 4

current through a diode flows through 1 direction only

Question 5

diode has a very ____ resistance in reverse direction?

Answer 5

diode has a very high resistance in reverse direction

Question 6

what are diodes useful for?

Answer 6

controlling flow of current in circuits

Question 7

what does led stand for?

Answer 7

light-emitting diode

Question 8

unlike normal diode, what does an led do when current passes through?

Answer 8

led gives off light when current passes through

Question 9

leds are an energy efficient source of ___?

Answer 9

leds are an energy efficient source of light