Ohms Law Questions and Answers for Viva

Answer-1: Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage across it, given a constant temperature.

Answer-2: It is called Ohm's law because it was discovered by the German physicist Georg Simon Ohm.

Answer-3: The mathematical formula for Ohm's Law is V = I * R, where V represents voltage, I represents current, and R represents resistance.

Answer-4: According to Ohm's Law Resistance is directly proportional to voltage and inversely proportional to current.

Answer-5: According to Ohm's Law, voltage and current are directly proportional. This means that as voltage increases, current increases, and vice versa, as long as resistance remains constant.

Answer-6: According to Ohm's Law, current and resistance are inversely proportional. This means that as resistance increases, current decreases, and vice versa, as long as voltage remains constant.

Answer-7: Ohm's Law is used in circuit analysis to calculate unknown values, such as voltage, current, or resistance, when the other two values are known.

Answer-8: Resistance is typically measured in ohms (Ω).

Answer-9: No, resistance cannot be negative according to Ohm's Law because it represents the opposition to the flow of electric current and cannot have negative physical significance.

Answer-10: In terms of Ohm's Law, AC (alternating current) circuits and DC (direct current) circuits follow the same principles. However, AC circuits involve time-varying voltages, while DC circuits have constant voltages.

Answer-11: Temperature affects resistance in Ohm's Law. As the temperature increases, the resistance of a conductor also increases.

Answer-12: Conductors have low resistance and allow the flow of electric current, while insulators have high resistance and impede the flow of electric current.

Answer-13: Yes, power (P) in a circuit can be calculated using the formula P=VI, where V is voltage and I is current. Alternatively, using Ohm's Law, P=I²R or P=V²/R.

Answer-14: In a parallel circuit, the voltage across each branch is the same, while in a series circuit, the total voltage is divided among the components. Ohm's Law can be applied to calculate current and resistance in both types of circuits.

Answer-15: The graphical representation of Ohm's Law is a straight line when voltage is plotted against current, with the slope of the line representing the resistance.

Answer-16: No, Ohm's Law cannot be directly applied to non-linear devices because their resistance changes with voltage or current.

Answer-17: According to Ohm's Law, the resistance of a conductor is directly proportional to its length and inversely proportional to its cross-sectional area.

Answer-18: Ohm's Law can be applied to real-world circuits and systems to design electrical devices, calculate power consumption, analyze electrical faults, and optimize circuit performance.

Answer-19: Ohm's Law cannot be directly applied to circuits with capacitors or inductors because these components store and release energy, affecting the relationship between voltage and current.

Answer-20: Conductivity is the inverse of resistance and represents a material's ability to conduct electric current. Higher conductivity corresponds to lower resistance, and vice versa.