Advertisements
Advertisements
प्रश्न
How is electric current related to the potential difference across the terminals of a conductor?
Draw a labelled circuit diagram to verify this relationship.
Advertisements
उत्तर
V = IR, where V is potential difference, I is current and R is constant for a given resistor as its resistance. Hence, current I is directly proportional to V.

APPEARS IN
संबंधित प्रश्न
An electrical bulb is marked 200V, 100W. Calculate the electrical resistance of its filament. If five such
bulbs are connected in series to a 200V supply, how much current will flow through them?
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.
What is meant by the drift speed of free electrons?
A wire connected to a power supply of 230 V has power dissipation P1. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case, power dissipation is P2. The ratio of `"P"_2/"P"_1` is
Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.
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?
The temperature of a conductor is increased. The graph best showing the variation of its resistance is:
In the context of Ohm's Law, Current (I) is defined as:
From Ohm's Law, since \[I \propto V\], the constant ratio \[\frac{V}{I}\] is defined as:
If the voltage across a conductor is increased while its temperature remains unchanged, what happens to the current flowing through it?
