Efficiency is the fraction of energy that is usefully transferred.
10 of 20
Some specialised machines are 100% efficient, true or false?
FALSE
11 of 20
What is the formula for efficiency?
efficiency=useful energy out/ total energy in (*100%)
12 of 20
An 11W energy efficient lightbulb has 100J of energy transferred to it. It transfers 65J of energy to light energy. How efficient is this lightbulb?
65/100 (*100%)= 65% efficient
13 of 20
If there was a sankey diagram with a 200J input and a 50J useful output how much energy is wasted?
150J
14 of 20
Out of the following appliances which 2 have the most percentage use?-Entertainment, Cooking, Fridges/freezers, Lighting, Dishwahers/washing machines or Other.
Entertainment (20%) and Lighting (20%).
15 of 20
Why do people choose to buy appliances that are not really necessary?
We have thee ability to, we enjoy comforts/ luxuries, a way to show off, it's a priviledge of our modern day society and we have the financial stability.
16 of 20
In what form is the useful energy output in a nuclear power station?
Thermal energy
17 of 20
The energy found in moving objects is kinetic ,true or false?
TRUE
18 of 20
What is the stored energy in a catapult?
Elastic potential
19 of 20
Gravitational potential is the energy stored in raised objects, true or false?
TRUE
20 of 20
Other cards in this set
Card 2
Front
What is the word formula for specific heat capacity?
Back
Energy=Mass*specific heat capacity*theta
Card 3
Front
What is the symbol formula and it's units?
Back
Card 4
Front
As you have to rearrange the formula what is the equation to use for specific heat capacity is?
Back
Card 5
Front
What does the amount of energy stored in an object depend on?
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