Physics
Which of the following combinations have the same equivalent resistance between X and Y?
In figure (a), the resistors are connected in parallel between X and Y. Let R' be the resistance they have in common. 1 / R' now equals 1 / 2 + 1 / 2 = 2 / 2 ohm ohm ohm ohm ohm o [1] R' = 1 ohm In...
Fig. below shows the I-V characteristic curves for two resistors. Identify the ohmic and non-ohmic resistors. Give a reason for your answer.
The resistors in graphs (a) and (b) are non-ohmic and ohmic, respectively. The I-V graph for (a) is a curve, but the I-V graph for (b) is a straight line or linear.
Give two differences between an ohmic and non-ohmic resistor
Ohmic resistor It follows Ohm's law, which states that V / I is constant for all V or I values. At a given temperature, the slope of the V-I graph is the same for all values of V or I. Non-ohmic...
What are non-ohmic resistors? Give one example and draw a graph to show its current-voltage relationship.
Non-ohmic resistors (also known as non-linear resistances) are conductors that do not obey Ohm's law. LEDs, solar cells, junction diodes, and other similar devices are examples.
Draw a I-V graph for a linear resistor. What does its slope represent?
A linear resistor's I-V graph Slope of the I-V graph: I / V is the slope of the I-V graph. ΔI / ΔV is the reciprocal resistance of the conductor i.e. Slope = ΔI / ΔV = 1 / resistance of the...
Define the term resistance. State its S.I. unit.
The obstruction offered to the flow of current by the conductor is known as its resistance. The S.I. unit of resistance is Ohm.
(a) State whether the current is a scalar or vector? What does the direction of current convey?
(b) State whether the potential is a scalar or vector? What does the positive and negative sign of potential convey?
(a) Current is a scalar quantity. The direction of current conveys that the electrons flow opposite to the direction of flow of current. (b) Potential is a scalar quantity. The positive sign of...