current/charge/volatge/resistance

Question 1

Current unit

Answer 1

amperes A

Question 2

size of current =

Answer 2

rate of flow of charge
or charge per sec

Question 3

electric charge unit

Answer 3

coulombs C

Question 4

Current unit

Answer 4

amperes A

Question 5

1 amp = how many c

Answer 5

1C per sec

Question 6

equation for charge flow, current, time

Answer 6

charge = current x time

Question 7

electron flow

Answer 7

-negative to positive

Question 8

Components of a circuit: battery

Answer 8

2 or more cells

Question 9

Components of a circuit: ammeter

Answer 9

measures current

Question 10

potential difference

Answer 10

-energy transferred to component that passes through it

Question 11

resistance

Answer 11

-electrons passing through components have to push their way through lots of vibrating atoms
=resistance

Question 12

unit for resistance

Answer 12

ohms

Question 13

larger resistance .. =

Answer 13

lower current

Question 14

ohms’ law states

Answer 14

-current passing through the resistor at a constant temp
-is directly proportional to PD of resistor

Question 15

ohmic conductor

Answer 15

resistance stays constant as current changes
-when temp is constant = obeys ohms law

Question 16

reversing pd across resistor =

Answer 16

reverses current

Question 17

non ohmic conductor eg

Answer 17

filament lamp
diode

Question 18

non ohmic conductor - filament lamp

Answer 18

-resistance isn’t constant
-charge depends on current
-not proportional
-higher current = more resistance as temp increases

Question 19

non ohmic conductor - diode

Answer 19

-low resistance in forward direction
-high resistance in the reverse direction

Question 20

thermistors

Answer 20

temp dependent resistor
-resistance decreases if temp increases

Question 21

series circuits

Answer 21

consist of one loop of wire

Question 22

current in series circuits

Answer 22

-same current through each component

Question 23

series circuits - PD

Answer 23

-total pd is shared between components

Question 24

series circuits - resistance

Answer 24

-total R = R1+R2

Question 25

Parallel circuits

Answer 25

consists of 2 or more loops of wire

Question 26

Parallel circuits - pd

Answer 26

-pd is same across all components

Question 27

Parallel circuits - current

Answer 27

-total current = sum of current through components on each loop

Question 28

Parallel circuits - resistance

Answer 28

-total resistance is less than the resistance of the smallest resistor
-1/R1 + 1/R2 = Rt