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Energy Conversion

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Introduction

I have carried out a practical experiment based on energy conversions using a calorimeter and I am going to state the procedures of my practical experiment as well as calculating the amount of heat transfer.

I firstly started with weighting an empty calorimeter and recorded its mass.

Secondly I chose to weigh the same calorimeter with water (approximately 100g).

Thirdly I had to find the difference to get the mass of water.

Fourthly I measured the initial temperature of water in the calorimeter and recorded it.

Fifthly I decided to heat the water in the calorimeter to raise its temperature.

Sixthly I recorded the final temperature from the thermometer and the time taken.

 Mass of empty calorimeter (g) Mass of calorimeter with water (g) Mass of water (g) Initial temperature (oC) Final temperature (oC) Temperature difference (oC) Time taken (sec) Electricity to heat 23.2 123.2 100 18 31 13 302 Gas to Heat 72.5 173.5 101 19 32 13 44

Middle

I  = Current

T = Time

V = Volt

Energy output = mCΔT

m  = Mass

C   = Specific heat capacity

ΔT = Temperature change

Electricity to heat

Energy input:   I   = 5   ×   T= 302   ×   V=7.5

= 11325

Energy input        = 11325 (J)

Energy output: m = 100   ×   C = 4.2   ×   ΔT = 13

= 5460

Energy output      = 5460 (J)

Gas to Heat

The calorific value of British gas is 39.5kJ kG-1and I have used 320g of British gas.

Energy input:  320 × 39.5

= 12640 (J)

Energy input          = 12640 (J)

Energy output:  m = 101   ×   C = 4.2   ×   ΔT = 13

= 5514.6

Energy output       = 5514.6 (J)

Also I have been asked to calculate energy from Electricity to Kinetic of the following question:

Case study: A laboratory lifts uses an electrical motor to raise a carriage which weighs 35KN, through a vertical height of 10M at a steady speed, If the motor uses a current of 30amps at a potential difference of 450 and runs for 30sec.

Q1) How much work must it do?

A) The following equation is used for work done: W = FD

Conclusion

As well as electricity to heat loses its energy when the electric device produces light and sound as waste energy. There are many pros and cons to consider when it comes to choosing between a gas heat transfer and electric heat transfer for any particular task. They both can be pretty efficient in their own way.

The down side of gas heat is in the name itself. The gas heat depends on fossil fuels to stay alive. The problem with that is most likely going to be the surge in prices when fossil fuels are in short supply. This can cause the bill to rise well over.

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