Energy Efficiency Experiments

Authors Avatar by serhad1234hotmailcouk (student)


Method-Experiment 1

Firstly we put a light bulb into water which was about 150ml and let a current through to the light bulb. We measured the current, voltage, start temperature, final temperature and the time taken to get a temperature change of 10°C. 

Experiment 1light bulb                    Data 


Energy input = 7.24 x 2.07 x 262 = 3926J 

Energy Input= Current x Voltage x Time

Energy output = 0.15 x 4.187 x 10 = 6.2805J         

Useful energy output= Mass x Specific heat capacity x Temperature change 

Wasted energy output = 3926 - 6.2805 = 3919J 

Wasted energy output= Energy input – Useful Energy output

Energy → Light energy + Heat energy 

Efficiency = 6.2805 ÷ 3926 x 100 = 0.16% 

Efficiency=Useful energy output ÷ Energy input

Useful energy→ light

Wasted energy→ heat

Input energy→ electricity

Output energy→ light+ heat

Electrical energy→ light+ heat

Method-Experiment 2

In this experiment we ran a current through an aluminium block and recorded the temperature change of 10°C. The procedure was the same as experiment 1 as it used an immersion heater to heat up the aluminium block and then record its mass. 

Experiment 2Aluminium Block 


Energy input = 9.63 x 3.78 x 328 = 11940J 

Energy Input= Current x Voltage x Time

Energy output = 1.0046 x 913 x 10 = 9171.998J 

Useful energy output= Mass x Specific heat capacity x Temperature change 

Useful energy output = 9.0414J


Electrical energy → Heat energy Efficiency = 9171.998 ÷ 11940 x 100 = 77% 

Useful energy output ÷ energy input x 100

Energy input= Electrical.

Output = heat.

Useful= heat.

Wasted= heat.

Energy→ heat.


Method –Experiment 3

In this experiment we timed how long the glider went past the light gate. We measured the mass of the glider, height of the ramp at highest end, length of the ramp, measured the length of the card and recorded the time. We repeated the experiment 5 times as the air track experiment isn’t as accurate as experiment 1 and 2 so by doing it a few times will help us come up with more accurate and reliable results. 

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Experiment 3Air track (repeated 5 times) 

 Average= 40 seconds

Energy input= gravitational potential energy.

Output= kinetic energy+ heat+ sound.

Useful= kinetic energy.

Wasted= heat+ sound.

Energy input = 0.1 x 9.81 x 0.24 = 23.544J 

Energy input= Mass x Gravity x Height

Energy output = 0.5 x 0.1 x (2.22 ÷ 0.4)2 = 1.54J 

Energy output= 0.5 x Mass x Velocity²=0.5 x Mass (distance ÷ Time)²

Useful energy output = 1.54J 

Gravitational potential energy → Kinetic energy + Heat energy 

Efficiency = 1.54 ÷ 23.544 = 1.17864424% 

 Efficiency= Energy output ÷ Energy input

Method-Experiment 4

In this experiment we ...

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