Advertisements
Advertisements
प्रश्न
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?
Advertisements
उत्तर
Ohm's law is true only if the temperature of the conductor is constant.
APPEARS IN
संबंधित प्रश्न
If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.
- 0.2 A
- 0.5 A
- 2 A
- 5 A
Find the resistance of a conductor if 0.24 A current is passing through it and a potential difference of 24 V is applied across it.
The relationship between the potential difference and the current in a conductor is stated in the form of a law.
1) Name the law.
2) What does the slope of V-I graph for a conductor represent?
3) Name the material used for making the connecting wire.
Find the expression for the resistivity of a material and state the SI unit of resistivity.
Ohm's law gives a relationship between:
(a) current and resistance
(b) resistance and potential difference
(c) potential difference and electric charge
(d) current and potential difference
The unit of electrical resistance is:
(a) ampere
(b) volt
(c) coulomb
(d) ohm
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?
How would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.
Show by a diagram how two resistors R1 and R2 are joined in parallel. Obtain an expression for the total resistance of the combination.
In the circuit shown in the figure, find the total resistance of the circuit and the current in the arm AD.
How does an increase in the temperature affect the specific resistance of a :
(i) Metal and
(ii) Semiconductor ?
A metal sphere is kept on an insulting stands. A negatively charged rod is brought near it, then the sphere is earthed as shown. On removing the earthing, and taking the negatively charged rod away, what will be the nature of charge on the sphere? Give reason for your answer.
State the limitations of Ohm’s law.
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
The unit of specific resistance is ____________.
The temperature of a conductor is increased. The graph best showing the variation of its resistance is:
A heater of 220 V heats a volume of water m 5 mint time. A heater of 110 V heat in ten second. The resistance of the conductor is
The heat produced by a 100 w heater in 2 minute is equal to
Let the resistance of an electrical device remain constant, while the potential difference across its two ends decreases to one fourth of its initial value. What change will occur in the current through it? State the law which helps us in solving the above stated question.
