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प्रश्न
How does the resistance of a metallic wire depend on its temperature? Explain with reason.
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उत्तर १
With the increase in temperature of conductor, both the random motion of electrons and the amplitude of vibration of fixed positive ions increase. As a result, the number of collisions increases. Hence, the resistance of a conductor increases with the increase in its temperature. The resistance of filament of a bulb is more when it is glowing (i.e., when it is at a high temperature) as compared to when it is not glowing (i.e., when it is cold).
उत्तर २
The resistance of a metallic wire increases with increase in its temperature.
संबंधित प्रश्न
Calculate the quantity of heat produced in a 20 Ω resistor carrying 2.5 A current in 5 minutes.
The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are as given below:
| V (volts) | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 4.0 | 5.0 |
| I (amperes) | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.8 | 1.0 |
Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.
How much work is done in moving a charge of 2 C across two points having a potential difference of 12 V?
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(i) current through 6 Ω resistor?
(ii) potential difference across 12 Ω resistor?
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In the circuit shown below:
The potential difference across the 3 Ω resistor is:
