Topic 2

Question 1

current is

Answer 1

the rate of flow of charge round the circuit

Question 2

voltage (potential difference) is

Answer 2

the driving force that pushes the current around

Question 3

resistance is

Answer 3

anything in the circuit which slows the flow down

Question 4

if you increase the voltage then,

Answer 4

more current will flow

Question 5

if you increase the resistance then,

Answer 5

less current will flow

Question 6

potential difference is the energy transferred per unit charge passed

Answer 6

true

Question 7

1 volt =

Answer 7

1 joule/ coulomb

Question 8

current is conserved at

Answer 8

a junction

Question 9

a parallel circuit is one with

Answer 9

branches

Question 10

current doesn’t get used up or lost,

Answer 10

it is conserved

Question 11

total current entering junction is equal to

Answer 11

current leaving junction

Question 12

Voltage (V)=

Answer 12

currrent (I) X resistance (r)

Question 13

ammeter measures the

Answer 13

current

Question 14

ammeter must be placed in

Answer 14

series

Question 15

voltmeter measures the

Answer 15

voltage

Question 16

voltmeter must be placed in

Answer 16

parallel

Question 17

fixed resistors graph have

Answer 17

straight diagonal line

Question 18

filament lamp has

Answer 18

curved upward

Question 19

diode has

Answer 19

flat below 0 but curved upwards after 0

Question 20

light up

Answer 20

resistance down

Question 21

temperature up

Answer 21

resistance down

Question 22

resistors get hot when

Answer 22

an electric current passes through them

Question 23

the energy transfer in a resister is due to

Answer 23

electrons colliding with ions in the lattice as they move through it

Question 24

as heat increases,

Answer 24

resistance increases

Question 25

if it gets too hot,

Answer 25

no current will flow

Question 26

fuses protect circuits by

Answer 26

melting of breaking down if the current gets too high

Question 27

other advantages of heating in electric current

Answer 27

toasters; contain a coil of wire with a really high resistance, it glows and gives off infrared radiation which cooks the bread

Question 28

power (P)=

Answer 28

current (I) X voltage (V)

Question 29

Energy transferred=

Answer 29

current (I) X voltage (V) X time (t)