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प्रश्न
Define the following:
One ohm
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उत्तर
One ohm is the resistance of a component when the potential difference of one volt applied across the component drives a current of one ampere through it.
संबंधित प्रश्न
What is Resistivity?
The graph between V and I for a conductor is a straight line passing through the origin.
What should remain constant in a statement of this law?
The resistors R1, R2, R3 and R4 in the figure given below are all equal in value.
What would you expect the voltmeter A, B and C to read assuming that the connecting wires in the circuit have negligible resistance?
A resistance of 40 ohms and one of 60 ohms are arranged in series across 220 volt supply. Find the heat in joules produced by this combination of resistances in half a minute.
What is the necessary condition for a conductor to obey Ohm’s law?
- Draw a V-I graph for a conductor obeying Ohm’s law.
- What does the slope of V–I graph for a conductor represent?
A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross section, what will be its new resistance?
How would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.
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?
Define the following:
Coulomb
State the limitations of Ohm’s law.
What are non-ohmic conductors? Give one exmaple. Draw a current-voltage graph for a non-ohmic conductor.
Choose the correct alternative.
Which of the following is an ohmic conductor?
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.
Which of the following is correct for V-I graph of a good conductor?
The temperature of a conductor is increased. The graph best showing the variation of its resistance is:
State Ohm's Law. Represent it mathematically.
