Advertisements
Advertisements
प्रश्न
Define temperature coefficient of resistance.
उत्तर
The temperature coefficient is defined as the ratio of the increase in resistivity per degree rise in temperature to its resistivity at T0.
APPEARS IN
संबंधित प्रश्न
Fill in the following blank with suitable words:
Resistance is measured in .............. The resistance of a wire increases as the length ..............; as the temperature ..............; and as the cross-sectional area .............. .
Calculate the current flowing through a wire of resistance 5 Ω connected to a battery of potential difference 3 V.
Show by a diagram how two resistors R1 and R2 are joined in parallel. Obtain an expression for the total resistance of the combination.
Consider the sacle of voltmeter shown in the diagram and answer the following questions :
(a) What is the least count of the voltmeter?
(b) What is the reading shown by the voltmeter ?
(c) If the voltmeter is connected across a resistor of 20 `Omega` how much current is flowing through the resistor?
State microscopic form of Ohm’s law.
Explain the equivalent resistance of a series resistor network.
The resistance of a nichrome wire at 0°C is 10Ω. If its temperature coefficient of resistivity of nichrome is 0.004/ °C, find its resistance of the wire at boiling point of water. Comment on the result.
Two cells each of 5V are connected in series across an 8Ω resistor and three parallel resistors of 4Ω, 6Ω, and 12Ω. Draw a circuit diagram for the above arrangement. Calculate
- the current drawn from the cell
- current through each resistor
Which of the following I-V graph represents ohmic conductors?
Which of the following is correct for V-I graph of a good conductor?