9.3+ 9.4 the electron gun,IV characteristics

Question 1

how do you calculate the kinetic energy of an electron?

Answer 1

Question 2

what is the kinetic energy of electrons?

Answer 2

when a potential difference accelerates a charged particle, the energy transfered is equal to the kinetic energy gained by the particle (usually an electron)

Question 3

what is resistance?

Answer 3

• opposition to current (electrons flowing through)
• resistance=p.d across component/current in component

Question 4

what is 1 ohm?

Answer 4

the resistance of a components that has a p.d of 1v flowing per 1 amph of current

Question 5

what is ohms law?

Answer 5

which temperature of a (ohmic) comductor is constant, the current is directly proportional to the p.d

r is constant

Question 6

what happens as temperature increases to resistance?

Answer 6

• kinetic energy increases
• metal ions vibrate at a higher amplitude
• oppose the motion of electrons creating resistance

Question 7

draw IV graph for resistor

Answer 7

Question 8

draw an IV graph for a filament light bulb

Answer 8

Question 9

draw an IV graph for a diode/LED

Answer 9

Question 10

what determines whether the current has a negative or posititve reading?

Answer 10

the positioning of the battery

Question 11

draw the IV graph for a thermistor

Answer 11