chapter 9

Question 1

công thức emf

Answer 1

total workdone when charge goes round a complete circuit

Question 2

Potential difference

Answer 2

used when charges lose energy

energy given up by unit charge as it move from point A to point B

Question 3

pd formula

Answer 3

p.d = emf - I x r

Question 4

electric field

Answer 4

E=F/Q

E=V/d

Question 5

In series

Answer 5

I1=I2=I
R1 + R2 = Rt
V1 + V2 = Vt

Question 6

In parallel

Answer 6

I = I1 + I2 
V = V1 = V2
1/R = 1/R1 + 1/R2

Question 7

Resistivity

Answer 7

p= R x (cross sectional area / length)

Question 8

Energy in điện

Answer 8

E= V x Q

Question 9

Power

Answer 9

P= VI = IIR = V^2/R

Question 10

energy transferred

Answer 10

E = VIt

Question 11

Kirchoff’s first law

Answer 11

sum of the current entering any point in a circuit is equal to the sum of the currents leaving that point

Question 12

ohm’s law

Answer 12

the current through a conductor between two points is directly proportional to the potential difference across the two points.

Question 13

A non- ohmic device

Answer 13

doesn’t follow Ohm’s Law.

Question 14

Semi Conductor Devices

Answer 14

their current is not proportional to the voltage linearly,

Question 15

ohmic device

Answer 15

current varies proportionally to voltage

Question 16

thresh hold voltage

Answer 16

0.6 v

Question 17

bulb/filament lamp

Answer 17

as V increase => more electron => more collision with fillament particles => particle move around more => gain Electron and heat up => more resistance
as temp increase so does the réistance

Question 18

potential divider equation

Answer 18

Vout = (R2/R1+R2) x Vin

Question 19

electric field

Answer 19

• EF is the same at all point
• Force is the same at all point
• Constant force => constant acceleration
• the closer the plates => higher voltage => electric field strength and vice versa
• An electric charge moving through a uniform electric field follows a parabolic path