cheeky 1 markers

Question 1

define the term specific heat capacity

Answer 1

the amount of energy required to rasie the temperature of one kilogram of the substance by one degree

Question 2

define the term power

Answer 2

power is defined as the rate at which energy is transfered
or at which work is done

Question 3

wasted energy is often dissipated give the ways this energy is generally transferred to the surroundings

Answer 3

heat and sound

Question 4

describe what is meant by the term ‘renewable energy resource’

Answer 4

renewable energy resource is one that is being (or can be) replenished as it is used

Question 5

give the main energy resources available for use on earth

Answer 5

fossil fuels, nuclear fuels , bio-fuels , wind, hydroelectricity , geothermal, the tides, the sun and water waves

Question 6

describe the environmental impacts of fossil fuels

Answer 6

they are non-renewable so we will run out, when burned they produced CO2 which causes global warming, they can cause huge environmental disasters if not removed from the stores safely (e.g. oil spills)

Question 7

describe why the filament lamp has a different shaped current potential difference graph to the fixed resistor

Answer 7

as temperature increases the resistance increases, when this increases the current will decrease, so the graph will curve slightly

Question 8

describe why the diode has a different shaped current potential difference graph to the fixed resistor

Answer 8

the current can only flow through the diode in one direction, because the diode has a very high resistance in the reverse direction

Question 9

give the potential difference and frequency of mains electricity in the uk

Answer 9

230V 50Hz

Question 10

define the term internal energy

Answer 10

the total kinetic energy and potential energy of all the particles which made up a system

Question 11

describe how heating changes the internal energy within a system

Answer 11

heating increases the energy of the particles within the system, this either raises the temperature of the system or produced a change of state

Question 12

define the term heat capacity

Answer 12

the specific heat capacity of a substance is the amount of energy required to raise the temperature of one kilogram of the substances by one degree

Question 13

define the term specific latent heat

Answer 13

the amount of energy required to change the state of one kilogram of the substance with no change in temperature

Question 14

describe the motion of particles in a gas

Answer 14

particles are in constant random motion