Advertisements
Advertisements
प्रश्न
The heat developed in a system is proportional to the current through it.
पर्याय
It cannot be Thomson heat
It cannot be Peltier heat
It cannot be Joule heat
It can be any of the three heats mentioned above
Advertisements
उत्तर
It cannot be Joule heat
Joule heat is directly proportional to the square of the current passing through the resistor. Peltier heat is directly proportional to the current passing through the junction.Thomson heat is also directly proportional to the current passing through the section of the wire. Thus, the heat developed can be either Thomson heat or Peltier heat. But it cannot be Joule heat.
APPEARS IN
संबंधित प्रश्न
Show variation of resistivity of copper as a function of temperature in a graph.
Define the term 'conductivity' of a metallic wire. Write its SI unit.
Define current density. Write an expression which connects current density with drift speed
The following figure shows a conductor of length l with a circular cross-section. The radius of the cross-section varies linearly from a to b. The resistivity of the material is ρ. Assuming that b – a << l, find the resistance of the conductor.
An electrolysis experiment is stopped and the battery terminals are reversed.
A heater coil is to be constructed with a nichrome wire (ρ = 1.0 × 10−6 Ωm) that can operate at 500 W when connected to a 250 V supply. (a) What would be the resistance of the coil? (b) If the cross-sectional area of the wire is 0.5 mm2, what length of the wire will be needed? (c) If the radius of each turn is 4.0 mm, how many turns will be there in the coil?
For a metallic conductor, what is the relation between current density (J), conductivity (σ) and electric field intensity (E)?
In Figure 3 given below, find the value of resistance x for which points A and B are at the same potential:
figure 3
A carbon resistor is shown in the figure. Using color code, write the value of the resistance.
Consider a current carrying wire (current I) in the shape of a circle.
Assertion: Bending a wire does not effect electrical resistance.
Reason: Resistance of wire is proportional to resistivity of material.
A man covers his body with a blanket of thickness 4 mm. His temperature is 37°C and that of the atmosphere is 27°C. If the coefficient of thermal conductivity of wool is 1.2 × 10-5 MKS units, heat lost by him per hour per square meter area is:
As the temperature of conductor increase, it's resistivity and conductivity change. The ratio of resistivity to conductivity.
Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity ρC, ρT, ρM and ρA respectively. Then:
