Electricity

Question 1

Electric Field

Answer 1

a region of space where a charged object experiences a force due to its charge

Question 2

Coulombs Law

Answer 2

the force between two point charges is:
- proportional to the product of their charges
- inversely proportional to the square of their separation

Question 3

Uniform Electric Fields

Answer 3

can be created between two opposite but equally charged plates
(field strength will be same everywhere between)

Question 4

Electric Potential Difference (V)

Answer 4

the work done (w) when one unit of charge (q) moves between two points

Question 5

Voltage vs P.D

Answer 5

Voltage = energy at 1 point
P.D = energy diff. between 2 points

Question 6

Electronvolt (1eV=1.6x10^-19)J

Answer 6

energy an electron would gain by being accelerated by a P.D of 1 volt

Question 7

Drift Velocity

Answer 7

speed of an electron

Question 8

Electric Current

Answer 8

rate of flow of electric charge

Question 9

• to +

Answer 9

electron flow

Question 10

+ to -

Answer 10

conventional current

Question 11

current is same around circuit

Answer 11

SERIES

Question 12

current splits between branches

Answer 12

PARALLEL

Question 13

V is same for each branch

Answer 13

PARALLEL

Question 14

V = V1 + V2

Answer 14

SERIES

Question 15

Ideal Ammeter

Answer 15

r = 0

Question 16

Ideal Voltmeter

Answer 16

r = infinity

Question 17

Connected in Parallel

Answer 17

Voltmeter

Question 18

Connected in Series

Answer 18

Ammeter

Question 19

Resistance

Answer 19

the ratio of P.D across the component to current flowing across the component
R=V/I

Question 20

R in Series

Answer 20

Rt = R1 + R2

Question 21

1/Rt = 1/R1 + 1/R2

Answer 21

Resistance in Parallel

Question 22

Prop of a substance that gives a measure of how substance opposes election flow.

Answer 22

Resistivity (P)

Question 23

Two Resistors in Series

Answer 23

Voltage divides up proportional to their resistances

Question 24

Where it connects dictates the proportion of current that it gets, (higher join = higher V)
(lower join = lower V)

Answer 24

Potentiometer (single resistor)

Question 25

Light Dependent Resistors

Answer 25

as light intensity decreases, resistance increases

Question 26

Thermistors

Answer 26

as temp. increases, resistance decreases

Question 27

Strain Gauges

Answer 27

as stretched the cross-sectional area decreases, resistance increases