Advertisements
Advertisements
प्रश्न
Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?
Will current flow more easily through a thick wire or a thin wire of the same material when connected to the same source? Give reason for your answer.
Advertisements
उत्तर १
The current will flow more easily through thick wire. It is because the resistance of a
conductor is inversely proportional to its area of cross-section. If thicker the wire, less is resistance and hence more easily the current flows.
उत्तर २
Resistance (R) is inversely proportional to the area of the cross-section (A) of the
wire. So, thicker the wire, lower is the resistance of the wire and vice-versa.
Therefore, current can flow more easily through a thick wire than a thin wire.
`R = rho xx l/A`
`R ∝ 1/A`
उत्तर ३
The resistance of a conductor is inversely proportional to its area of cross-section, i.e. `R ∝ 1/A`. So as the conductor is a thick wire, its resistance decreases and current will flow easily through it, in comparison with a thin wire.
APPEARS IN
संबंधित प्रश्न
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.
Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s 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?
Four resistances of 16 ohms each are connected in parallel. Four such combinations are connected in series. What is the total 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 would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.
Fig. represents the circuit used for the verification of ohm's law. Label the different parts from A and F. State the function of each.
An ammeter placed in series with an electric radiator reads 0.5 amps and a voltmeter placed across it reads 230 volts. What is the resistance of the radiator?
Answer the following question.
Distinguish between Ohmic and non-ohmic substances; explain with the help of example.
Define Current density.
Define temperature coefficient of resistance.
Which of the following is correct for V-I graph of a good conductor?
Calculate the total resistance of the circuit and find the total current in the circuit.
A current of 2amp flowing through a conductor produced 80 joule of heat in 10 sec. The resistance of the conductor is:-
Ohm's law deals with the relationship between ______
Consider a current carrying wire (current I) in the shape of a circle. Note that as the current progresses along the wire, the direction of j (current density) changes in an exact manner, while the current I remain unaffected. The agent that is essentially responsible for is ______.
What is the resistance of a conductor through which a current of 0.5 A flows when a potential difference of 2V is applied across its ends?
The voltage - current readings of a certain material are shown in the table given below:
| Voltage (V) | 10 V | 20 V | 30 V |
| Current (I) | 2 A | 3 A | 4 A |
Study the table.
- State whether the conductor used is ohmic or non-ohmic.
- Justify your answer.
- State Ohm's law.
A current of 3.2 mA flows through a conductor. If charge on an electron is −1.6 × 10-19 coulomb, find the number of electrons that will pass each second through the cross section of that conductor.
