Advertisements
Advertisements
प्रश्न
How does the resistance of a metallic wire depend on its temperature? Explain with reason.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
How much energy is transferred by a 12 V Power supply to each coulomb of charge which it moves around a circuit?
If a potential difference of 10 V causes a current of 2 A to flow for 1 minute, how much energy is transferred?
The other name of potential difference is:
The potential difference between the terminals of an electric iron is 240 V and the current is 5.0 A. What is the resistance of the electric iron?
Keeping the potential difference constant, the resistance of a circuit is doubled. The current will become:
The following table shows current in Amperes and potential difference in Volts.
Which law will the graph prove? Explain the law.
Calculate the current flowing through each of the resistors A and B in the circuit shown in the following figure.
Suppose there are three resistors A, B, and C having resistances r1, r2, and r3 respectively. If R represents their equivalent resistance, establish the following relation R = r1 + r2 + r3 when joined in series.
Find out the following in the electric circuit given in Figure
- Effective resistance of two 8 Ω resistors in the combination
- Current flowing through 4 Ω resistor
- Potential difference across 4 Ω resistance
- Power dissipated in 4 Ω resistor
- Difference in ammeter readings, if any.
Find the potential difference required to flow a current of 300 mA in a wire of resistance 20 Ω.
