Physics - Electricity

Question 1

what is electricity about

Answer 1

form of energy resulting from the existence of charged particles (such as electrons or protons), either statically as an accumulation of charge or dynamically as a current

Question 2

what are circuits

Answer 2

path or loop that allows electricity to pass through

Question 3

what is a circuit diagram

Answer 3

simplified and shorthand version of a circuit, that shows how all components are connected

Question 4

what is the current

Answer 4

the flow of charge

Question 5

what is an ammeter

Answer 5

an instrument that measures current

Question 6

what is an ampere

Answer 6

unit measurement for current, denoted the symbol A

Question 7

what is an ohm

Answer 7

unit to measure resistance, denoted symbol Q

Question 8

what is resistance

Answer 8

measure of how difficult it is for curred to pass, measured in ohms

Question 9

what is voltage

Answer 9

measure of the amount of energy provided to charges or used by them, measured in volts V

Question 10

what is a voltmeter

Answer 10

instrument that measures voltage

Question 11

what are volts

Answer 11

unit used to measure voltage, symbol V

Question 12

current vs voltage?

Answer 12

voltage is the difference in electrical potential between two points
current is the rate of flow of electric charge

Question 13

parallel vs series circuit

Answer 13

parallel - components are connected in branches and are adjacent to one another, voltmeters are connected in parallel
series - components are connected with each other in a single line, ammeters are connected in series

Question 14

dc vs ac current

Answer 14

dc - generated by electrons always moving in one direction
ac - generated by electrons changing the direction they move in

Question 15

what is a generator

Answer 15

they work on the principle of electromagnetic induction, involving the creation of electric current in a wire when it is exposed to a changing magnetic field

Question 16

what is a motor

Answer 16

a machine that uses electromagnetism to spin, it needs a current carrying coil and a magnet

Question 17

what is a transformer, give examples

Answer 17

eg - power lines
a transformer is a device that is used to transfer electrical energy between two circuits through electromagnetic induction

they consist of 2 coils of wire, called the primary coil and the secondary coil, that is wrapped around a magnetic core. when the AC flows through the primary coil creating a changing magnetic field that induces an AC voltage in the secondary coil