Electric Quantities

Question 1

What is current

Answer 1

Rate of flow of charge

Question 2

What is the formula for current

Answer 2

I=q/t

Question 3

What is the definition of one amp

Answer 3

When one coulomb of charge flows through a conductor/wire every second

Question 4

What is voltage

Answer 4

The amount of energy supplied per coulomb of charge

Question 5

What is the formula of voltage

Answer 5

V=IR, V=E/Q, E=VIT

Question 6

What is conventional current

Answer 6

The flow of current from positive to negative.

The flow of free electrons from negative to positive

Question 7

What is emf

Answer 7

The amount of energy supplied to each coulomb of charge from non electrical to electrical form to move the charges around the circuit

Question 8

What is pd

Answer 8

The amount of energy supplied to each coulomb of charge from electrical to non electrical form between two points in a circuit

Question 9

What is an ammeter

Answer 9

It’s used to measure current in a circuit and is always connected in series and has negligible resistance

Question 10

What is a voltmeter

Answer 10

It’s used to measure voltage across a component and is always connected in parallel and has infinite resistance

Question 11

What is a short circuit

Answer 11

A short circuit occurs when there’s a path with less resistance as current travels through the shortest path

Question 12

What is resistance

Answer 12

The ratio of the voltage across the component to current flowing through the component

Question 13

What is the definition of one ohm

Answer 13

Resistance of the material when one amp of current flows through it if the pd applied across is one volt

Question 14

What is ohms law

Answer 14

Current flowing through a conductor is directly proportional to the pd across it provided that resistance is constant

Question 15

What is resistivity

Answer 15

The property of a material that determines it’s ability to conduct electricity

Question 16

What is the relationship between resistance and length

Answer 16

They are directly proportional

Question 17

What is the relationship between resistance and cross sectional area

Answer 17

They are inversely proportional

Question 18

Current in series circuits

Answer 18

Current is equal at all points

Question 19

Current in parallel circuits

Answer 19

Current is shared by each branch

Question 20

Voltage in series circuits

Answer 20

Voltage is split

Question 21

Voltage in parallel circuits

Answer 21

Voltage is equal in every branch

Question 22

What is Direct current(DC)

Answer 22

Flow of electrons in one direction only

Question 23

What is AC

Answer 23

Direction of flow reverses periodically

Question 24

What are electric insulators

Answer 24

Materials that don’t have free electrons therefore electricity doesn’t flow through them

Question 25

What are electric conductors

Answer 25

Materials that have free electrons and electricity flows through them

Question 26

How can an insulator become charged

Answer 26

By rubbing with another insulator due to which electrons are transferred from one material to the other

Question 27

What is confined charge

Answer 27

When electrons are transferred in a certain region and cant flow because the object is an insulator

Question 28

What is induced charge

Answer 28

The process by which electrical charges in an electrically neutral object are re arranged due to a presence of a charged object close to them without any contact

Question 29

What is earthing

Answer 29

The process by which a conductor can be neutralised electrically either by adding or removing electrons from the conductor. Earthing is done by connecting the conductor to the ground

Question 30

What is an electric field

Answer 30

A region of space around a charged object in which it can exert a force on another charged object.

Question 31

What direction do positive charges go

Answer 31

Outwards

Question 32

What direction do negative fields go

Answer 32

Inwards

Question 33

What are the dangers of static electricity

Answer 33

Filling fuels, rolling paper and grain shoots

Question 34

What are the dangers of static electricity

Answer 34

Filling fuels, rolling paper and grain shoots