topic 2 -year 11

Question 1

what is electric current

Answer 1

a flow of electric charge

Question 2

what kind of circuit will electric charge flow through

Answer 2

a complete circuit if there is a potential difference

Question 3

what is needed to make a current flow

Answer 3

a source of potential difference

Question 4

what is the unit of current

Answer 4

ampere, A

Question 5

what is potential difference

Answer 5

a driving force that pushes the charge round

Question 6

what is the unit of potential difference

Answer 6

volts, v

Question 7

what is resistance

Answer 7

anything that slows the flow of electric charge down

Question 8

what does the current flowing through a component depend on

Answer 8

the potential difference across it and the resistance of the component

Question 9

the greater the resistance across a component …

Answer 9

the smaller the current that flows (for a given potential difference across the component.)

Question 10

what is the size of the current

Answer 10

the rate of the flow of charge

Question 11

what does the ammeter measure

Answer 11

the current in amps flowing through the test wire

Question 12

how must the ammeter be placed when investigating

Answer 12

in series with whatever your investigating with

Question 13

what does the voltmeter measure

Answer 13

the potential difference across the test wire in volts

Question 14

how must the voltmeter be placed when investigating

Answer 14

in parallel around whatever your investigating

Question 15

what happens if we close the switch of a circuit

Answer 15

then electrons flow out of the cell and move around the circuit- which is called the electric current `

Question 16

how do electrons move in cells

Answer 16

from the negative end of the cell to the positive end of the cell

Question 17

what are the electrons carrying from the cell

Answer 17

energy

Question 18

what do the electrons pass the energy to in the circuit

Answer 18

the pass it to the components such as the lamp

Question 19

in the lamp of a circuit how is energy transferred

Answer 19

to light energy and thermal energy

Question 20

how much energy are electrons carrying when they return to the positive end of the cell

Answer 20

they are carrying less energy than when they left the negative end

Question 21

how can we measure the current in a circuit

Answer 21

by using an ammeter

Question 22

describe the current in a series circuit

Answer 22

it is same all the way around

Question 23

describe the current in parallel circuits

Answer 23

the current in the branches adds up to the total current leaving the cell

Question 24

electric charge is measured in

Answer 24

C

Question 25

a current of 1 ampere =

Answer 25

1 coulomb of charge flowing per second

Question 26

describe the potential difference in parallel circuits

Answer 26

it is the same across each component