P1.7 Energy Efficientcy

Question 1

What does it mean to be efficient

Answer 1

Performing in the best way possible with the least waste of time or effort

Question 2

What is energy efficientcy then

Answer 2

Energy efficiency is about getting as much useful energy output as possible from a device

Question 3

Calculation for energy efficieny

Answer 3

EE = useful output energy / total input energy

EE has no measurement

Question 4

How do we present a energy efficiency unit (measurment wise)

Answer 4

% or decimal

Question 5

True or false
A device can have 120% energy efficiency

Answer 5

False
You cannot create energy

Question 6

What energy transfers are in a solar pannel. Do you think theyre worth investing in globally?

Answer 6

Light - electrical

No as it depends on the light of the sun therefore countries that don’t get a lot of sunlight will have an energy shortage

Question 7

2 drawbacks of solar use

Answer 7

Not much sunlight in the UK
Needs mantanence which is expensive
Only works during the day

Question 8

Whys it importsnt to know the wasted energy

Answer 8

We can use outputs for purposes such as light and heat which we may not realise. We can also develop devices to minimise the amount of energy output is being wasted

Question 9

How can we reduce wasted energy in wires

Answer 9

Use short or thicker wires to reduce electrical resistance