- Energy given out = mass of water × 4.2 × temperature change.
- Energy measured in joules, J.
- 4.2 is the specific heat capacity of water, J/g°C.
- Temperature change = temperature of water after heating – temperature of water before heating.
What is the energy content of fuel?
| Energy Source Unit Energy Content (Btu) | Fuel Oil no.6 1 Gallon 152400 | Diesel Fuel 1 Gallon 139000 | Gasoline 1 Gallon 124000 | Natural Gas 1 Cubic Foot (cu.ft.) 950 – 1150 |
|---|
What is energy formula?
The energy stored in an object due to its position and height is known as potential energy and is given by the formula:
P.E. = mgh
.
Unit
. The SI unit of energy is Joules (J).
How do you calculate energy?
The formula that links energy and power is:
Energy = Power x Time
. The unit of energy is the joule, the unit of power is the watt, and the unit of time is the second.
How much energy is in a gallon of petrol?
Refinery efficiency is about 90 percent and the energy content of a gallon of gasoline is about 132,000 Btu. Put that together and you have about 13,000 Btu of energy cost per gallon of gasoline produced, which is equivalent in energy terms to
4 kilowatt hours
.
How much energy is in a gallon of gasoline?
The energy content of a gallon of gasoline is
132,000 Btu
and the refinery efficiency is 90 percent. The amount of energy cost per gallon of gasoline produced is equivalent to about 4 kilowatt hours.
How much energy is in a liter of gasoline?
One litre of gasoline contains the energy equivalent to
8.9 kWh of
electricity.
How do you calculate energy in joules?
In equation form:
work (joules) = force (newtons) x distance (meters)
, where a joule is the unit of work, as defined in the following paragraph. In practical terms, even a small force can do a lot of work if it is exerted over a long distance.
How do you calculate energy in chemistry?
- add together the bond energies for all the bonds in the reactants – this is the ‘energy in’
- add together the bond energies for all the bonds in the products – this is the ‘energy out’
- energy change = energy in – energy out.
Can you calculate energy without mass?
If a particle has no mass (m = 0) and is at rest (p = 0), then the
total energy is zero (E = 0)
.
How many kWh is a gallon of petrol?
calorific values: diesel: 10.7 kWh/l; jet fuel: 10.4 kWh/l; petrol:
9.7 kWh/l
.
How much gas does it take to produce 1 kWh?
Second: A high efficiency, natural gas-fired combined-cycle power plant might consume about 7000 Btus of gas to produce one kilowatt-hour of electricity. That would be about
7 cubic feet
of natural gas. It would therefoe take about 7000 cubic feet of gas to produce one megawatt-hour.
How do you calculate energy absorbed?
You can do this easily: just
multiply the heat capacity of the substance you’re heating by the mass of the substance and the change in temperature
to find the heat absorbed.
How many joules are in a gas?
To put how small a joule is into perspective, a liter of gasoline has
31,536,000 joules
of energy in it. A kilowatt-hour is equal to 3,600,000 joules.
How do you convert kWh to mpg?
For example, if your kWh mileage is a pretty good 3.7 and your charging factor is 0.4 (you nearly always charge at work during the day), then your estimated miles per gallon of gas is (3.7 * 120,429) / (7809 * 0.4) =
143 miles / gallon
.
How many kWh is a Litre of petrol?
| Fuel Unit of supply Energy (kWh per unit) | Mains gas 100 cu.ft. 31.59 | Heating oil or diesel kg litre 13 10.9 | Petrol kg litre 13.1 9.6 | Ethanol kg litre 7.5 5.9 |
|---|
How do you calculate work energy and power?
work done
= force × distance moved in direction of force
. change in gravitational energy = mgh. power = work donetime taken, power = rate of energy transfer. power = force × velocity.
What is the equation that gives the energy of a photon?
E=hf=hcλ
(energy of a photon) E = h f = h c λ (energy of a photon) , where E is the energy of a single photon and c is the speed of light. When working with small systems, energy in eV is often useful. Note that Planck’s constant in these units is h = 4.14 × 10
− 15
eV · s.
How do you convert energy into electricity?
- power = energy time.
- kW = kWh h.
- time = energy power.
- h = kWh kW.
How do you calculate the energy of a photon?
- Photon energy can be expressed using any unit of energy such as the electronvolt (eV) or the Joule (J). …
- P = F × E (equation 3)
- P = F × hc/l (equation 4)
- P (mW) = 1.989 × 10
– 10
× F/l (nm) (equation 5)
How do you calculate the number of photons from wavelength and energy?
According to the equation
E=n⋅h⋅ν
(energy = number of photons times Planck’s constant times the frequency), if you divide the energy by Planck’s constant, you should get photons per second.
What is Q in Q MC ∆ T?
Q=
mc
ΔT Q = mc Δ T , where Q is the symbol for heat transfer, m is the mass of the substance, and ΔT is the change in temperature. The symbol c stands for specific heat and depends on the material and phase. The specific heat is the amount of heat necessary to change the temperature of 1.00 kg of mass by 1.00oC.
What does Q MC t mean?
Q = mc∆T. Q =
heat energy
(Joules, J) m = mass of a substance (kg) c = specific heat (units J/kg∙K) ∆ is a symbol meaning “the change in”
How do you calculate the energy released by bond formation?
- Add together the bond energies for all the bonds in the reactants – this is the ‘energy in’.
- Add together the bond energies for all the bonds in the products – this is the ‘energy out’.
- Calculate the energy change = energy in – energy out.
How do you calculate energy transferred?
The formula which links energy transferred, power and time, and the formula which helps you calculate the energy transferred is as follows:
Energy transferred = power x time.
How are photons massless?
If there was a way (there isn’t; special relativity prohibits it) to observe a photon at rest, you would find it massless.
All the relativistic mass of the photon comes from it’s energy
. … This is why we usually say that photons are massless.
How do you calculate delta T?
The equation of delta t is:
ΔT = T2 – T1
.
How many joules are in a gram of gasoline?
Combustion of 1 gram of natural gas produces 54 kJ of energy. Similarly, the combustion of 1 gram of petrol (gasoline) produces
48 kJ
of energy.
What is energy density in fuel?
The higher the energy density of the fuel, the more energy may be stored or transported for the same amount of volume. The energy density of a fuel per unit mass is called
the specific energy of that fuel
.
Are mass and energy the same thing?
So
energy and matter are really the same thing
. Completely interchangeable. And finally, Although energy and mass are related through special relativity, mass and space are related through general relativity. … So in a way, energy, matter, space and time are all aspects of the same thing.
How do you calculate heat absorbed by a gas?
The invariability of volume means that gas doesn’t do any work and the heat absorbed by gas is precisely the same as internal energy change:
ΔU = Q = Cv * n * ΔT .
What is energy density and how is it calculated?
Energy Density is defined as
the total amount of energy in a system per unit volume
. For example, the number of calories per gram of food. Foodstuffs that has low energy density provide less energy per gram of food which means that you can eat more of them since there are fewer calories.
How do you calculate specific energy density?
Energy density is
equal to 1/2*C*V
2
/weight
, where C is the capacitance you computed and V should be your nominal voltage (i.e 2.7 V). Power Density is V
2
/4/ESR/weight, where ESR is the equivalente series resistance.
