electricity need to know

Question 1

definition of current

Answer 1

flow of electrical charge. the charge is carried by the electrons which flow around the circuit

Question 2

Q stands for?

Answer 2

charge ( coulombs, C)

Question 3

I stands for?

Answer 3

current ( A, amps)

Question 4

what is alternating current

Answer 4

changes directions repeatedly many times per second. This gives it a frequency

Question 5

in the UK all a.c sources have a frequency of?

Answer 5

50Hz

Question 6

what is direct current?

Answer 6

flows in only one direction around the circuit, never changing direction

Question 7

does direct current have a frequency?

Answer 7

no

Question 8

what’s a source of A.C

Answer 8

the electrical main, generators

Question 9

whats a source of D.C

Answer 9

batteries, solar panels

Question 10

what displays A.C or D.C current?

Answer 10

an oscilloscope

Question 11

what does a.c look like on an oscilloscope

Answer 11

it goes up and down like a wave

Question 12

what does d.c current look like on an oscilloscope

Answer 12

it is a straight line

Question 13

what is an electrical field?

Answer 13

it’s the area surrounding an electrical charge ( or group of charges) where other charges can experience a force

Question 14

how does a V-I graph look?

Answer 14

a straight line through the origin with its gradient equal to the resistance

Question 15

fact

Answer 15

resistors in series give a total effective resistance equal to the SUM of the individual resistors

Rs= R1+R2+R3+…

Question 16

relationship for resistors in parallel?

Answer 16

1/Rp = 1/R1 + 1/R2 + 1/R3
to find R on its own u need to flip the fraction

Question 17

what is the relationship between the temperature and resistance of a conductor

Answer 17

TURD temp up resistance down

Question 18

how to verify ohms law

Answer 18

connecting a resistor to a power supply and measuring the current in the resistor as the supply voltage is increased

Question 19

relationship between temperature and resistance?

Answer 19

TURD temp up resistance down

Question 21

fact 1 volt =?

Answer 21

1 volt = 1 joule per coloumb

Question 22

V stands for?

Answer 22

potential difference / voltage (volts, V)

Question 23

what is the potential difference for a component in a circuit? (e.g lamp, resistor, motor etc)

Answer 23

the potential difference is a MEASURE of the energy TRANSFERRED BY each coloumb of charge

Question 24

how is a voltmeter connected to a circuit?

Answer 24

in parallel

Question 25

how is an ammeter connected to a circuit?

Answer 25

in series

Question 26

in a series circuit the current is?

Answer 26

equal at all points

Question 27

in a series circuit the voltage is?

Answer 27

shared between each of the components

Question 28

in a parallel circuit the current is?

Answer 28

split up between each of the loops in the circuit

Question 29

in a para

Question 30

if voltage increases then the current?

Answer 30

increases

Question 31

if the resistance increases the current?

Answer 31

decreases

Question 32

if the resistance increases then the voltage?

Answer 32

increases

Question 33

what number of amp should be used for appliances rated UP TO 720W

Answer 33

3A fuse

Question 34

what number of amp should be used for appliances rated OVER 720W

Answer 34

13A

Question 35

if there are two resistors connected in parallel in a circuit and another resistor is now connected in paralllel with the two resistors in the circuit what effect will this have on the current

Answer 35

it will increase as the total resistance decreases