electricty

Question 1

flows in one direction for a time then changes direction

Answer 1

alternative current

Question 2

quoted voltage and frequency

Answer 2

AC

Question 3

constant value

Answer 3

DC

Question 4

Vpeak=

Answer 4

√2 Vrms

Question 5

what is the x-axis of the oscilloscope

Answer 5

time base setting

Question 6

how to find frequency

Answer 6

count the number of square to complete one wave x the time base setting the f=1/T

Question 7

series circuit: current, voltage, resistance

Answer 7

current is the same at all points
voltage is split across components
resistance is added together

Question 8

parrallel circuit: current, voltage, resistance

Answer 8

current is split
voltage is the same in all points =to supply
resitance 1/Rt=1/R1+1/R2….

Question 9

the opposition to current flow

Answer 9

resistance

Question 10

greater resistance=

Answer 10

lower current

Question 11

power (watts)

Answer 11

energy transferred per second

Question 12

emf

Answer 12

the energy per unit charge that flows through the source
joules per coulomb

Question 13

why is there internal resistance

Answer 13

due to the chemicals present in the battery

Question 14

what is a short circuit

Answer 14

a circuit with no load resistance

Question 15

what is the terminal potential difference

Answer 15

the voltage across the terminals of the battery

Question 16

what are lost volts

Answer 16

the voltage lost when a current is drawn across the internal resistor

Question 17

what is the Y intercept of a voltage current graph

Answer 17

emf

Question 18

what is the gradient of a voltage current graph

Answer 18

internal resistance

Question 19

what is the x intercept of a voltage current graph

Answer 19

short circuit current

Question 20

what dos a capacitor do

Answer 20

stores charge and energy

Question 21

the charge stored in the capacitor is

Answer 21

proportional to voltage and defined as the charge per unit voltage

Question 22

1 farad=

Answer 22

1 coulomb per volt

Question 23

when is the capacitor fully charged

Answer 23

when the voltage across it is equal to the supply

Question 24

what is the current when a capacitor is fully charged

Answer 24

0

Question 25

what increases the time for a capacitor to charge

Answer 25

increase resistance
increase capacitance

Question 26

the area under a voltage charge graph

Answer 26

equal to work done from charging the capacitor

Question 27

conductor

Answer 27

material with many free electrons. these electrons can easily move through the material

Question 28

insulator

Answer 28

material with very few electrons

Question 29

semiconductors

Answer 29

lies somewhere between conductors and insulators. they are insulators but will conduct when impurities are added