electric circuits

Question 1

long rectangle shape..

Answer 1

resistor

Question 2

play button..

Answer 2

diode
allows current in one direction

Question 3

play button w arrows…

Answer 3

LED, emits light

Question 4

what is charge measured in

Answer 4

coolombs (c)

Question 5

what determines the size of current

Answer 5

rate of the flow of the charge

Question 6

a current of 1A=

Answer 6

1c of charge per sec

Question 7

charge equation

Answer 7

charge flow (q) = current (I) x time (t)

Question 8

what is a battery

Answer 8

two or more cellls connected together

Question 9

what direction does current flow

Answer 9

pos to neg

Question 10

what is a current

Answer 10

flow of charge around a circuit

Question 11

what is cahrges symbol

Answer 11

Q

Question 12

resistence?

Answer 12

how much energy required to push a coolomb of charge

Question 13

potential dif equation

Answer 13

potential dif = current x resistence

Question 14

whats resietcne measyred in

Answer 14

ohms

Question 15

what is potential dif

Answer 15

energy transferred per coulomb of charge
or the force that drives electrons around the circuit

Question 16

potential dif equation

Answer 16

V = I x R

OR E = V x Q

Question 17

potential dif in parralel circuits..

Answer 17

some for all components

Question 18

explain required practical resistence

Answer 18

so you have a long wire attached to a circuit and clipped onto a ruler and the clips can slide so you can ajust the amount on the circuit. the length of the wire is proportional to the resistence

Question 19

how to stop a zero error and why there is one in required practical resistnce

Answer 19

the clip is very hard to get actually at zero and theres a small resistence between the clip and the wire. zero error means the value should be at zero but isnt and wont be so youve got to subtract the zero error

Question 20

temp issue in required prac resistence

Answer 20

temp is porpotional so can increase it, so you want to make sure you maintain a low pd which willl lower the current and stop any heat. you can do this with a variable resistor which controls the amount of current

Question 21

explain practical components and resistence

Answer 21

to see if the resistence depends on the current in dif components. measure potential dif and current as normal and then use the variable resistor to change the current and coninue to make note. also flip the cell to change direction of current. repeat

Question 22

fialment lamp results

Answer 22

as the current increases its temperature increases and atoms vibrate more increasing the resistence, same with any metal. so its graph is fast and then slows to a halt.

resistence increases as temp increases as its a metal

Question 23

diode results

Answer 23

diode needs an etxra resistor as it i very sensitive to strong currents. in the reverse its resistence is so high it does not have any current and in the normal it takes until 0.6v for the current to raise

resietnce is very low one way and too high the other

Question 24

what happens to LDRs and thermistors ressitence when the temp/light increases

Answer 24

they are not metal and it decreases

Question 25

properties of series

Answer 25

current is the same evrywhere
total pd is shared between components
total resistence is shared between compoents

Question 26

what do resistors do

Answer 26

limit the current

Question 27

properties of a parralel

Answer 27

current is shared begtween loops
all PD is the same

Question 28

bigger the resistence..

Answer 28

less current will pass through

Question 29

adding more resistence/ components..

Answer 29

decreases the total resistence which may seem weird but its like the pd will always be the same so if you add more it will increase the current entering and resistor is basically pd divided by current.

Question 30

what do diodes do

Answer 30

like valves, only allow flow in one direction

Question 31

energy equations

Answer 31

E = P x T

E = V x Q

E= V x I x T

Question 32

power equations

Answer 32

P = E/T

P= I x V

P= I2 x R

Question 33

what is charge

Answer 33

current flowing through in a period of time