AT1

Question 1

What are the required components for a working circuit?

Answer 1

-Voltage source
-load/components
-closed circuit

Question 2

Define Ohms law

Answer 2

‘When a resistor is kept at a constant temp, its resistance will remain unchanged.’

Question 3

How is Ohms law calculated?

Answer 3

Voltage=current x resistance

Question 4

What is the effect of increasing resistance on current flow in a series circuit?

Answer 4

Increasing resistance decreases current flow

Question 5

What is Kirchoffs current law

Answer 5

The total current entering a junction in a circuit is equal to the total current leaving the junction

Question 6

What is kirchoffs voltage law?

Answer 6

The sum of the electrical potential differences around any closed loop in a circuit is zero.

Question 7

What is kirchoffs resistance law?

Answer 7

In a parralel circuit the total resistance is less than the individual resistor value

Question 8

What is power?

Answer 8

Energy transferred per second

Question 9

What is an energy transformation

Answer 9

When a device changes one type of energy into another

Question 10

What is the energy efficency calculation

Answer 10

useful energy over total energy x 100

Question 11

What is an energy source?

Answer 11

A source from which energy can be obtained to provide heat, light or power

Question 12

Energy efficency

Answer 12

% of useful energy from an amount of supplied energy

Question 13

Law of conservation

Answer 13

Can be transferred useufully, stored or dissipated cannot be created or destroyed

Question 14

What is energy transfer

Answer 14

The movement of energy from one location to another

Question 15

What is sound energy

Answer 15

When sound makes an object vibrate

Question 16

Chemical energy

Answer 16

Stored in molecules and atoms

Question 17

What is kinetic energy

Answer 17

A form of energy that an object has because of motion

Question 18

What is thermal energy?

Answer 18

Energy contained in a system that’s responsible for is temperature

Question 19

What is light energy?

Answer 19

A type of kinetic energy with the ability to make light for the human eye

Question 20

What is elastic energy

Answer 20

stored in an object due to force temporarily changing its shape. E.g. stretching

Question 21

What is GPE energy

Answer 21

The energy an object has due to its position above earth

Question 22

What is electric energy

Answer 22

Energy resulting from charged particles such as electrons through a conductor

Question 23

Calculation for kinetic energy

Answer 23

Ek=1/2mv squared

Question 24

Calculation for GPE

Answer 24

Egp=mgh

Question 25

How to calculate useful energy

Answer 25

Useful energy = watts x time

Question 26

How to calculate wasted energy

Answer 26

Wasted energy = total energy- useful energy

Question 27

Explain thermal transfer through conduction

Answer 27

The transfer of heat through objects touching

Question 28

Explain thermal transfer through convection

Answer 28

Occurs in fluids and in the movement of the fluid in itself

Question 29

Explain thermal transfer through radiation

Answer 29

Thermal energy is transferred through electromagnetic waves

Question 30

What is most wasted energy from

Answer 30

Heat or sound

Question 31

Describe work done

Answer 31

Force applied over distancerk done= force x distance

Question 32

what is biogas?

Answer 32

The mixture of methane and carbon dioxide

Question 33

What is biomass?

Answer 33

Renewable energy from plants and animals

Question 34

What is solar energy?

Answer 34

Energy created from the sun

Question 35

What is wind energy?

Answer 35

Renewable energy that uses wind to make electricity

Question 36

What is crude oil?

Answer 36

Extracted from earth refined into gas and jet fuel

Question 37

What is nuclear energy?

Answer 37

Released from the nucleus and made up of protons and neutrons

Question 38

What is gas energy?

Answer 38

Fossil energy source that is found beneath the earths surface

Question 39

How do hydroelectric farms work?

Answer 39

Water is stored in dams, realeased and flowed into turbines converts KE into ME, spinning turbine drives a generator producing electricity

Question 40

How do solar farms work?

Answer 40

SOlar panels absorb sunlight & CREATES DIRECT CURRENT ELECTRICITY inverter converts DC into AC(alternating current

Question 41

How do wind turbines work?

Answer 41

Blades capture wind energy, the rotor spins, the spinning motion transferred to gear box, the generator uses mechanical energy to make electricity

Question 42

Evaluate nuclear energy

Answer 42

Low carbon emissions and reliable but bad nuclear waste and high initial costs

Question 43

EValuate solar energy

Answer 43

Renewable and sustainable, low cost

Question 44

Are atoms electrons negatively charged?

Answer 44

The electrons are negatively charged and objects with additional electrons are negatively charged

Question 45

Compare voltage and current in parrallel and series circuits

Answer 45

in series circuits all components qare connected end to end, in parrallel circuits all components are connected in parrallel parts

Question 46

How is electrical power given?

Answer 46

P=VI

Question 47

Transfer energies

Answer 47

-Kinetic -Thermal -Sound -Light

Question 48

Potential energy

Answer 48

-GPE -Elastic -Electric -Chemical

Question 49

How can a homes thermal efficency be improved

Answer 49

By changes to conduction, convection or radiation