topic 2 -year 11 Flashcards Preview

gcse physics year 11 > topic 2 -year 11 > Flashcards

Flashcards in topic 2 -year 11 Deck (26)
Loading flashcards...
1
Q

what is electric current

A

a flow of electric charge

2
Q

what kind of circuit will electric charge flow through

A

a complete circuit if there is a potential difference

3
Q

what is needed to make a current flow

A

a source of potential difference

4
Q

what is the unit of current

A

ampere, A

5
Q

what is potential difference

A

a driving force that pushes the charge round

6
Q

what is the unit of potential difference

A

volts, v

7
Q

what is resistance

A

anything that slows the flow of electric charge down

8
Q

what does the current flowing through a component depend on

A

the potential difference across it and the resistance of the component

9
Q

the greater the resistance across a component …

A

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

10
Q

what is the size of the current

A

the rate of the flow of charge

11
Q

what does the ammeter measure

A

the current in amps flowing through the test wire

12
Q

how must the ammeter be placed when investigating

A

in series with whatever your investigating with

13
Q

what does the voltmeter measure

A

the potential difference across the test wire in volts

14
Q

how must the voltmeter be placed when investigating

A

in parallel around whatever your investigating

15
Q

what happens if we close the switch of a circuit

A

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

16
Q

how do electrons move in cells

A

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

17
Q

what are the electrons carrying from the cell

A

energy

18
Q

what do the electrons pass the energy to in the circuit

A

the pass it to the components such as the lamp

19
Q

in the lamp of a circuit how is energy transferred

A

to light energy and thermal energy

20
Q

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

A

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

21
Q

how can we measure the current in a circuit

A

by using an ammeter

22
Q

describe the current in a series circuit

A

it is same all the way around

23
Q

describe the current in parallel circuits

A

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

24
Q

electric charge is measured in

A

C

25
Q

a current of 1 ampere =

A

1 coulomb of charge flowing per second

26
Q

describe the potential difference in parallel circuits

A

it is the same across each component