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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
A low voltage supply from which one needs high currents must have very low internal resistance. Why?
Find the expression for the resistivity of a material and state the SI unit of resistivity.
Name the physical quantity whose unit is "ohm".
Keeping the p.d. constant, the resistance of a circuit is halved. The current will become:
(a) one-fourth
(b) four time
(c) half
(d) double
Which of the following is an ohmic resistance?
In an experiment of verification of Ohm’s law following observations are obtained.
|
Potential difference V (in volt) |
0.5 | 1.0 | 1.5 | 2.0 | 2.5 |
| current I (in ampere) | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 |
Draw a V-I graph and use this graph to find:
- the potential difference V when the current I is 0.5 A,
- the current I when the potential difference V is 0.75 V,
- the resistance in a circuit.
How does an increase in the temperature affect the specific resistance of a :
(i) Metal and
(ii) Semiconductor ?
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?
Fig. represents the circuit used for the verification of Ohm's law. Label the parts from A to F. state the function of each.
- Name and state the law which relates the potential difference and current in a conductor.
- What is the necessary condition for a conductor to obey the law named above in part (a) ?
State the limitations of Ohm’s law.
SI unit of resistance is:
An electronics hobbyist is building a radio which requires 150 Ω in her circuit, but she has only 220 Ω, 79 Ω, and 92 Ω resistors available. How can she connect the available resistors to get the desired value of resistance?
Which of the following is correct for V-I graph of a good conductor?
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is true?
State Ohm’s law? How can it be verified experimentally? Does it hold good under all conditions? Comment.
Calculate the total resistance of the circuit and find the total current in the circuit.
Ohm's law deals with the relationship between ______
