Energy Transfers (1) Flashcards
Three more of the appliances are also designed to transfer electrical energy to kinetic energy. Which three?
- fan
- drill
- washing machine
Describe the pattern shown in Graph A
Temperature increase and time switched on are directly proportional
After 300 seconds, Graph B shows the increase in temperature of the metal block is lower than the increase in temperature expected from Graph A.
Suggest one reason why
Energy transfer from the block to the surroundings
Which one of the metals will heat up the most?
Lead
Give, in terms of the amount of energy needed to heat the metal blocks, a reason for your answer
Needs least energy to raise temperature by 1 degrees celcius
Which appliance is designed to transform electrical energy to light and sound?
TV
Which two appliances transform energy at the same rate?
- hairdryer
- sandwich toaster
Name the other three appliances designed to transform electrical energy into heat
- iron
- hair dryer
- kettle
Which kettle costs the most to use?
Y
Energy cannot be transferred by convection through a __________
When the air near the freezer compartment is cooled, the energy of the air particles is ________
The spaces between the air particles are _________
The density of the air is increased
- solid
- decreased
- decreased
- increased
Which fridge, A, B, or C, would cost the least to use for 1 year?
Uses least energy in 1 year
What should she conclude about the pattern linking the volume of the fridge and the energy it uses in 1 year?
Greater the volume the greater the energy it uses
The householder could not be certain that her conclusion is correct for all fridges?
A very small number sampled
The electrician should not change the shower unless he switches off the mains electricity supply.
Explain why
He may receive an electric shock if he touches the live wire
How does the power of the new shower affect the cost of using the shower?
Give a reason for your answer
Cost is higher as more energy is used per second
