How is Voltage related to Resistance?

The relationship between voltage and resistance is represented by Ohm's Law. It usually means that the flowing current passing via a circuit is directly proportional to the applied voltage and also inversely proportional to the resistance, with a condition that the temperature remains constant.

The relation between voltage and resistance can be expressed as:

Voltage

  1. Voltage is also referred to as Potential Difference.
  2. Potential Difference can be expressed as the work done in obtaining a unit positive charge from one point to another point in the same conductor.
  3. Volt (V) is the unit of potential difference.

Resistance

  1. When current passes or flows through a circuit, it undergoes a given resistive force.
  2. The parameter that usually represents the magnitude of this resistive force  is often called resistance.
  3. Ohm (Ω) is the unit of resistance.

What is Ohm's Law?

As per Ohm’s Law, the current that flows through a circuit is directly proportional to the voltage. Assume that:

  • V = Voltage
  • I = Current
  • R = Constant of Proportionality

Therefore,

V∝I

or, V = IR

Thus, this is how the relation between voltage and resistance can be expressed.


Read More Related Questions:

  1. How many 176 Ω resistors (in parallel) are required to carry 5 A on a 220 V line?
  2. Three identical cells, each of 4 V and internal resistance r, are connected in series to a 6 ohm resistor. If the current flowing in the circuit is 2 A. The internal resistance of each cell is?
  3. n identical light bulbs, each designed to draw P power from a certain voltage supply, are joined in series across that supply. The total power which they will draw is?
  4. Two bulbs are rated (P1, V) and (P2, V). If they are connected (i) in series and (ii) in parallel across a supply V Find the power dissipated in the two combinations in terms of P1 and P2.
  5. Why is the series arrangement not used for domestic circuits?
  6. Define: 1 volt, Potential difference
  7. Is resistance constant in Ohm's law?
  8. Find the current through a resistance 2 ohm if the voltage across the resistance is 6 V.
  9. What are the applications of ohm's law used in daily life?
  10. Why Do We Use Ohm's Law?
  11. Obtain the equation J = σE of Ohm's law on the basis of drift velocity
  12. What Is Effective Resistance?
  13. A small bulb has a resistance of 2 ohms when it is cold. It draws 0.4-ampere current from a source of4V and then starts glowing. Calculate the resistance when it is glowing

Also Read:

CBSE CLASS XII Related Questions

  • 1.
    Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.


      • 2.
        A light copper ring is freely suspended by a light string. A bar magnet is held horizontally with its length along the axis of the ring. The magnet is moved towards the ring with its N pole facing the loop. What will happen to the ring and its position? Explain.


          • 3.
            Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

              • attract with a force \( \frac{F}{2} \)
              • repel with a force \( \frac{F}{2} \)
              • repel with a force \( F \)
              • attract with a force \( F \)

            • 4.
              Four independent waves are expressed as \[ (i)\; y_1=A_1\sin\omega t, \] \[ (ii)\; y_2=A_2\sin 2\omega t, \] \[ (iii)\; y_3=A_3\cos\omega t, \] \[ (iv)\; y_4=A_4\sin\left(\omega t+\frac{\pi}{3}\right) \] The interference between two of these waves is possible in

                • (i) and (iii) only
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                • All of them

              • 5.
                Draw the number of scattered particles versus the scattering angle graph for scattering of alpha particles by a thin foil. Write two important conclusions that can be drawn from this plot.


                  • 6.
                    Two parallel plate capacitors X and Y are connected in series to a 6 V battery. They have the same plate area and same plate separation but capacitor X has air between its plates, whereas capacitor Y contains a material of dielectric constant 4. Calculate the capacitances of X and Y, if the equivalent capacitance of the combination of X and Y is \( 4 \, \mu\text{F} \). Calculate the potential difference across the plates of X and Y.

                      CBSE CLASS XII Previous Year Papers

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