Table of Contents
Dimensions of Joule
The dimensions of joule represent the physical quantities involved in the measurement of energy. Joule is the SI unit of energy, work, or heat, and it is defined as the amount of energy transferred when a force of one newton is applied over a distance of one meter.
The joule dimensions can be derived from the formula for work or energy, which is force multiplied by distance. Force itself has the dimensional formula of mass (M), length (L), and time (T).
Joule’s Law expresses that when a current streams in a guide how much hotness produced is relative to current, obstruction, and time in the current streaming. Allow us to view the idea driving the joule’s regulation.
Numerical Representation of Joule’s Law
When in a current leading wire the hour of the streaming of current and the obstruction of the wire is steady, how much hotness delivered and the square of how much current streaming the wire are relative to one another.
Condition 1 :
Hαi2 (Where R and T are Constant)
When in a flow leading wire the hour of the streaming of flow and the flow of the wire are consistent, how much hotness created and how much electrical obstruction of the wire are relative to one another.
Condition 2:
HαR (Where R and T are Constant)
When in a flow leading wire how much the electrical opposition and how much flow are steady, the hotness created and the hour of flow streaming are corresponding to one another.
Condition 3:
Hαt (Where R and I are Constant)
Equation of Heat
Whenever conditions 1, 2, and 3 are consolidated, the subsequent recipe is-
Hαi2.Rt (I, R, and t are factors)
H=(i2 RTH) / j (where J is a Joule’s Constant)
The joule’s steady J is characterized as the quantity of work units that outfits one unit of hotness when changed over totally into heat.
The worth of J= 4.2 joules/cal.
What are the Joules Heating Effects Caused by Electric Current?
Whenever an electric flow goes through a transmitter, it expands the inside energy of the framework, which thus builds the net energy of its constituent particles and atoms, at last bringing about the development of hotness. The hotness created in a framework predominantly relies upon a significant of elements, which are
- The electrical obstruction presented by the transmitter is more is the opposition; more will be the hotness delivered.
- The more opportunity for which the current streams, more is the additional time span, more is the more hotness produced.
- How much current that goes through the guide. Higher is the size of current; more is the hotness created.
What are Some Applications of Joule’s Law?
Electric Heating Device: Some electrical gadgets like electric iron, electric toaster oven, and electric warmer depend on the standard of warming impact of electric flow. In these gadgets, Nichrome (a composite of nickel and chromium) is utilized as a warming component in numerous electrical gadgets. This is a direct result of the accompanying reasons,
- Nichrome has high explicit opposition.
- Nichrome has a high softening point.
- Nichrome isn’t oxidized without any problem.
Meld Wire: Fuse wire is a composite that contains 37% lead and 63% tin. Intertwine wire is generally associated in series in electric circuits. As it has high opposition and low dissolving point, when a huge size of electric flow moves through the electric circuit, the wire softens, subsequently making the circuit open and forestalling any harm to the electrical gadgets.
Electric Bulb: The fiber of an electric bulb offers extremely high protection from the progression of electric flow, that is the reason a high measure of hotness is created. This fiber, when warmed to brilliance, discharges light. The regularly utilized fiber is Tungsten, which has an exceptionally high liquefying point of 3380°C. The fiber of an electric bulb is encased in a glass that contains an idle gas at low tension.
Electric bend and electric welding are likewise founded on the warming impact of electrical current. Joule’s regulation warming impact of electric flow isn’t helpful when the idea is applied to frameworks like transformers and dynamos. These are the gadgets that assistance to decrease the deficiency of energy because of the warming impact of electric flow.
A few additional uses of the warming impact of electric flow are:
- Water warmer
- The glowing bulb (when its fiber is warmed it produces light).
- Intertwine (the wire breaks down and stops toe current stream in the circuit, limiting the harm to the family gadgets)
- Electric iron
- Electric oven.
Thermistors: Thermistors are a sort of resistors whose opposition changes when there is an adjustment of temperature.
Dimensions of Joule Per Gram
Joule Per Gram (J/g) is a unit commonly used to express thermal heat capacity. This unit indicates the amount of energy (in joules) per gram of a substance. It is also referred to as joules per gram or joule/gram. The dimensional formula for Joule Per Gram (J/g) is L²T⁻², where L represents length and T represents time.
To convert Joule Per Gram to the standard SI unit (J/kg), you simply multiply the value by 1000, as 1 J/g is equivalent to 1000 J/kg.
Dimensional Formula of Joule
The joule dimensional formula is [M1 L2 T-2]
Where,
- M = Mass
- L = Length
- T = Time
Dimensions of Joule Derivation
Joule is the SI unit of work done. Therefore, the formula(dimensional) of Joule = formula(dimensional) of work done.
We know that, (W) Work done = F(Force) × D(Displacement) . . . . (i)
we know that , Force = m.a = M1 [M0 L T-2]
we got, The dimensions of force as M1 L1 T-2 . . . . (ii)
we know that, the dimensions of displacement is [M0 L1 T0] . . . . (iii)
By substituting (ii) and (iii) in (i) we get,
Work (Joule)= FD = [M1 L2 T-2].
The dimensionally representation of joule is [M1 L2 T-2].
FAQs on Dimensions of Joule
What is the dimension of J?
The dimension of Joule (J) is expressed as: M^1L^2T^-2 This means that a Joule is made up of: M (Mass): 1 (it depends on mass) L (Length): 2 (it involves length squared) T (Time): -2 (it involves time squared in the denominator)
What is the SI unit of joule?
The SI unit of Joule is simply J. It is used to measure energy, work, or heat.
What is the dimension of joule per gram?
The dimension of Joule per gram (J/g) can be expressed as: M^0L^2T^-2 This means it is similar to Joules but divided by mass (grams), which cancels out the mass dimension (M) and leaves us with length squared over time squared.
What is the formula for joule?
The formula for Joule is: 1 Joule = 1 Newton * 1 meter In other words, 1 Joule is the amount of energy transferred when a force of 1 Newton moves an object 1 meter in the direction of the force.
