electrical systems

Question 1

what is in the nucleus

Answer 1

• protons
• neutrons

Question 2

what is the charge of neutrons

Answer 2

0

Question 3

what is the charge of protons

Answer 3

+1

Question 4

what is the charge of electrons

Answer 4

-1

Question 5

what are anions

Answer 5

negetively charge ions

Question 6

what are cations

Answer 6

positively charge ions

Question 7

Substances that conduct electricity are called

Answer 7

conductors

Question 8

what are common conductors

Answer 8

metal

Question 9

what is the flow of electricity

Answer 9

positive → negetive

Question 10

components of a circuit

Answer 10

• cell (battery)
• wire
• bulb
• switch

Question 11

definition of electrical current

Answer 11

rate at which the electric charge flows

Question 12

how to measure electrical charge

Answer 12

ammeter

Question 13

SI unit for electrical charge

Answer 13

ampere (A)

Question 14

definition of potential difference

Answer 14

The amount of energy needed to move a unit of charge from one point to another in an electrical circuit

Question 15

SI unit for potential difference

Answer 15

volt(V)

Question 16

definition of electrical resistance

Answer 16

The measure of how much a component opposes the flow of an electric current

Question 17

Conductors of electricity have _ electrical resistance

Answer 17

low

Question 18

insulators of electricity have _ electrical resistance

Answer 18

high

Question 19

SI unit for electrical resistance

Answer 19

ohm (Ω)

Question 20

application of resistors

Answer 20

increasing / decreasing brightness of a light bulb

Question 21

where are ammeters located

Answer 21

series

Question 22

where are voltmeters located

Answer 22

parallel

Question 23

what are resistors made of

Answer 23

• made from a mixture of fine carbon particles and a non-conductive ceramic material.
• The more carbon, the less the resistance

Question 24

difference between parallel and series

Answer 24

• number of paths
• brightness of bulbs
• if one bulb is removed/damaged

Question 25

number of paths in series circuit

Answer 25

- only one path - currents pass through components one after another

Question 26

number of paths in parallel circuit

Answer 26

- 2 or more paths - currents split up and passes through each branch at the same time - paths are independent of each other

Question 27

brightness of bulbs in series

Answer 27

dimmer

Question 28

brightness of bulbs in parallel

Answer 28

brightness

Question 29

if one bulb is removed/damaged in series circuit

Answer 29

- electrical current cannot flow through the circuit - remaining bulb(s) will not light up

Question 30

if one bulb is demoved/damaged in parallel circuit

Answer 30

- electrical current can still flow through the other paths - other bulb(s) will still light up

Question 31

what are the types of resistors

Answer 31

- viable - fixed

Question 32

Why are two bulbs connected in parallel usually brighter than two bulbs connected in series?

Answer 32

- Voltage is shared by two bulbs connected in series - Voltage experienced by both bulbs connected in parallel is the same

Question 33

which resistor has the arrow through it

Answer 33

viable

Question 34

formula for how much electricity was used

Answer 34

Power (kW) X Time (h) = kWh

Question 35

formula for cost

Answer 35

Cost per kWh ($) X [Power (kW) X Time (h)]