Electricity

Question 2

what is matter made up of

Answer 2

atoms and molecules

Question 3

what is the nucleus (centre of the atom) made up of

Answer 3

protons and electrons

Question 4

what happens when an atom loses an electron

Answer 4

it becomes positively charged (the process is called ionasation)

Question 5

what happens when objects rub aganist each other

Answer 5

gain a static charge while objects either gain or lose electrons (electrostatic force)

Question 6

objects with the same charges

Answer 6

repel

Question 7

objects with different charges

Answer 7

attract

Question 8

someone drags their feet while walking across a carpet. Describe how they might get an electric shock if they touch a metal door handle.

Answer 8

-the person has picked up a charge
-metals are good conductors of electricity
-electrons ‘jump’ between metal and person. so the person receives the shock

Question 9

what is current

Answer 9

the rate of flow of charge across the circut every second

Question 10

what is current measured in

Answer 10

amps (A)

Question 11

what is used to measure current at a point in the circut

Answer 11

ammeter

Question 12

what flows through a circut

Answer 12

electrons that are always negatively charged

Question 13

what is a series circut

Answer 13

a simple circut that has only one path for the current to flow. so the current is the same everywhere

Question 14

what is a parallel circut

Answer 14

a complex circut that has more than one path for the current to flow. the current going in a junction is either equally or inequally divided when the current comes out depending on the circut.

Question 15

what is potential difference

Answer 15

is the measure of the difference in energy that charges have between two points in a circut. has units of volts (V) and is measured by voltmeters which go in parallel of the circut. sometimes refered as voltage

Question 16

is potential difference between each parallel branch the same

Answer 16

YES

Question 17

is potential difference between components of a series circut the same

Answer 17

NO IT IS DIVIDED

Question 18

what is resitance

Answer 18

the measure of how hard is it for a current to flow through an electrical componet. meausred in ohms (Ω)

Question 19

electrical conductors have

Answer 19

low resitance

Question 20

insluators have

Answer 20

high resistance

Question 21

1.0 kΩ =

Answer 21

1000Ω

Question 22

what is the equation to find the potential difference

Answer 22

potential difference = current x resitance (V = I x R) (V = A x Ω)

Question 23

a thermistor has a resistance of 1.5 kΩ and a current of 0.5 A flowing through it. calculate the potential difference across the thermistor

Answer 23

step 1: write down the equation
step 2: subistute the variables in the equation
step 3: calculate answer + units

after you’re done the answer should be 750V

Question 24

a lamp has a resistance of 20 Ω and a current of 0.5 A flowing through it. calculate the potential difference across the lamp.

Answer 24

step 1: write down the equation
step 2: subistute the variables in the equation
step 3: calculate answer + units

after you’re done the answer should be 10V

Question 25

what is connecting wire

Answer 25

used to connect different parts of a circut togther

Question 26

draw connecting wire

Answer 26

should be a straight horizontal/vertical line

Question 27

draw a cell

Answer 27

should look like a straight horizontal line leading to a vertical line and a shorter vertical line not connected to each other and straight horizontal line leading out of it.

Question 28

what is a cell

Answer 28

provides potential difference to the circut

Question 29

what is a battery

Answer 29

made up of more than one cell

Question 30

draw a battery

Answer 30

same thing as a cell but twice

Question 31

draw a lamp

Answer 31

should look like a straight horizontal line leading to a circle with a cross around the circle leading out with the same line.

Question 32

what is a lamp

Answer 32

produces light

Question 33

draw a resistor

Answer 33

a straight horzitonal line with a rectangle with its horizontal line being longer than its vertical line leading out with the same line

Question 34

what is a resitor

Answer 34

limits the amount of current in the current and used to vary potential differences

Question 35

draw an open switch

Answer 35

should be a horizontal line leading to a small circle leading to another straight kind of diaganol line. then another small circle and horizontal line not connected to each other

Question 36

draw a closed switch

Answer 36

should look like an open switch but the diagonal line should be sitting on top of the two circles

Question 37

what is an open switch

Answer 37

makes a certain part of the circut incomplete so current is unable to flow through it

Question 38

what is a closed switch

Answer 38

makes a certain part of the circut complete so current is able to flow through it

Question 39

draw an ammeter

Answer 39

should look like a horizontal straight line leading to a circle with a capital a and leading the same line out of it

Question 40

what is an ammeter

Answer 40

measures the current in a current. goes in series in the part of the circut

Question 41

draw a voltmeter

Answer 41

should look like a horizontal straight line leading to a circle with a capital v and leading the same line out of it

Question 42

what is a voltmeter

Answer 42

measures the potential difference between two parts of a circut. goes in parallel around the componet. measured in volts

Question 43

the cell/battery should always be drawn

Answer 43

at the top of the circut

Question 44

draw a series circut that has a cell, ammeter and a voltmeter that goes in parallel of the resistor

Answer 44

:)

Question 45

draw a parallel circut that has a cell and 3 branches consiting of a lamp and a voltemeter that goes in parallel across it

Answer 45

;)