Advertisements
Advertisements
प्रश्न
Consider a circuit containing an ideal battery connected to a resistor. Do "work done by the battery" and "the thermal energy developed" represent two names of the same physical quantity?
Advertisements
उत्तर
Yes, the "work done by the battery" and "the thermal energy developed" represent two names of the same physical quantity. The work done by the battery on the resistor is dissipated by the resistor in the form of thermal energy. Hence the " work done by the battery " and " the thermal energy developed " represent two names of the same physical quantity.
However, a non-ideal battery, in this case, would have to do extra work in order to overcome the internal resistance of the battery. Hence, the work done by a non-ideal battery will not be equal to the thermal energy developed.
APPEARS IN
संबंधित प्रश्न
Show variation of resistivity of Si with temperature in a graph ?
Is work done by a battery always equal to the thermal energy developed in electrical circuit? What happens if a capacitor is connected in the circuit?
As temperature increases, the viscosity of liquids decreases considerably. Will this decrease the resistance of an electrolyte as the temperature increases?
The figure shows an electrolyte of AgCl through which a current is passed. It is observed that 2.68 g of silver is deposited in 10 minutes on the cathode. Find the heat developed in the 20 Ω resistor during this period. Atomic weight of silver is 107.9 g/mol−1.
Find the neutral temperature and inversion temperature of a copper-iron thermocouple if the reference junction is kept at 0°C. Use the data given in the following table.
| Metal with lead (Pb) |
a `mu V"/"^oC` |
b `muV"/("^oC)` |
| Aluminium | -0.47 | 0.003 |
| Bismuth | -43.7 | -0.47 |
| Copper | 2.76 | 0.012 |
| Gold | 2.90 | 0.0093 |
| Iron | 16.6 | -0.030 |
| Nickel | 19.1 | -0.030 |
| Platinum | -1.79 | -0.035 |
| Silver | 2.50 | 0.012 |
| Steel | 10.8 | -0.016 |
A variable resistor R is connected across a cell of emf ε and internal resistance r as shown in the figure. Draw a plot showing the variation of
(i) Terminal voltage V and
(ii) the current I, as a function of R.
By increasing the temperature, the specific resistance of a conductor and a semiconductor -
The temperature (T) dependence of resistivity of materials A and material B is represented by fig (i) and fig (ii) respectively. Identify material A and material B.
 fig. (i) |
 fig. (ii) |
Which expression gives resistivity \(\rho_T\) at temperature \(T\) in terms of resistivity \(\rho_0\) at reference temperature \(T_0\)?
Which expression gives resistance at a changed temperature?
What happens to electron collisions and relaxation time in metals as temperature rises?
For alloys such as nichrome, what is the effect of increasing temperature and the sign of \(\alpha\)?
A nichrome toaster element has a resistance of \(75.3\,\Omega\) at \(27^{\circ}\mathrm{C}\) and \(85.8\,\Omega\) at its operating temperature. If \(\alpha=1.7\times10^{-4}\,^{\circ}\mathrm{C}^{-1}\), what is the steady temperature approximately?
Which linear thermometer relation is used to find the temperature \(t\) when its resistance is \(R_t\)?
