Electricity

Question 1

Terminal pd

Answer 1

E transferred across terminals from supply per unit charge

Question 2

Internal r

Answer 2

R in power supply when e collides w/ atoms inside + E -> thermal E

Question 3

Potential difference

Answer 3

W done moving unit charge between 2 points in a circuit

From electrical energy to other forms

Question 4

Emf

Answer 4

Energy transfer per unit charge

From chemical to electrical form

Question 5

eV

Answer 5

E to accelerate an e through pd of 1

Question 6

Give a situation + advantage of using LEDs

Answer 6

Torch - draws lower I ∴ lasts longer

Question 7

Describe how the resistance of a diode depends on V

Answer 7

1) R = V/I
2) R isn’t constant in a diode
3) Values of V less that… R is infinite
4) Values is V more than… R is small
5) as V increases from… R decreases ∵ I increase more than V + Since R = V/I, R decreases