Question

what is ohm's law? define ohm's law​

Answer 1

HERE IS YOUR ANSWER

Explanation:

Ohm’s law states the relationship between electric current and potential difference. The current that flows through most conductors is directly proportional to the voltage applied to it. Georg Simon Ohm, a German physicist was the first to verify Ohm’s law experimentally.

Ohm’s Law Explanation

One of the most basic and important laws of electric circuits is Ohm’s law.

• Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperature remain constant.
• Mathematically, this current-voltage relationship can be written as,

Ohm's Law Equation:

• In the equation, the constant of proportionality, R is Resistance and has units of ohms, with symbol Ω.
• The same formula can be rewritten in order to calculate the current and resistance respectively as follows:
• Ohm’s law only holds true if the provided temperature and the other physical factors remain constant. In certain components, increasing the current raises the temperature. An example of this is the filament of a light bulb, in which the temperature rises as the current is increased. In this case, Ohm’s law cannot be applied. The lightbulb filament violates Ohm’s Law.

ohm's law statement:

• Ohm’s law states that the voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperature, remain constant.
• Ohm’s Law Equation: V = IR, where V is the voltage across the conductor, I is the current flowing through the conductor and R is the resistance provided by the conductor to the flow of current.
• Relationship Between Voltage, Current and Resistance
• Current-Voltage Relationship
• Analyzing row 1,2 and 3, we come to understand that doubling and tripling the voltage leads to doubling and a tripling of the current in the circuit. Likewise, when we compare rows 1 and 4 and rows 2 and 5, we come to understand that doubling the total resistance serves to halve the current in the circuit.
• Water Pipe Analogy for Ohm’s Law
• Ohm’s Law describes the current flow through a resistance when different electric potentials (voltage) are applied at each end of the resistance. Since we can’t see electrons, the water-pipe analogy helps us understand the electric circuits better. Water flowing through pipes is a good mechanical system that is analogous to an electrical circuit.

Appartus Required:

• Resistor
• Ammeter
• Voltmeter
• Battery
• Plug Key
• Rheostat
• Circuit Diagram:
• Experimental Verification of Ohm's Law

Procedure:

• Initially, the key K is closed and the rheostat is adjusted to get the minimum reading in Ammeter A and voltmeter.
• The current in the circuit is increased gradually by moving the sliding terminal of the rheostat. During the process, the current flowing in the circuit and the corresponding value of potential difference across the resistance wire R are recorded.
• This way different sets of values of voltage and current are obtained.
• For each set of values of V and I, the ratio of V/I is calculated.
• When you calculate the ratio V/I for each case, you will come to notice that it is almost the same. So V/I = R, which is a constant.
• Plot a graph of the current against the potential difference, it will be a straight line. This shows that the current is proportional to the potential difference.
• Similar Reading:

Ohm's Law Formula:

• Ohm’s Law Applications
• The main applications of Ohm’s law are:
• To determine the voltage, resistance or current of an electric circuit.
• Ohm’s law is used to maintain the desired voltage drop across the electronic components.
• Ohm’s law is also used in dc ammeter and other dc shunts to divert the current.
• Limitations of Ohm’s Law

What does Ohm’s law state?

Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

What can Ohm’s Law be used for?

Ohm’s law is used to validate the static values of circuit components such as current levels, voltage supplies, and voltage drops.

Is Ohm’s Law Universal?

No. Ohm’s law is not a universal law. This is because ohm’s law is only applicable to ohmic conductors such as iron and copper but is not applicable to non-ohmic conductors such as semiconductors.

Why is Ohm’s law not applicable to semiconductors?

Ohm’s law doesn’t apply to semiconducting devices because they are nonlinear devices. This means that the ratio of voltage to current doesn’t remain constant for variations in voltage.

When does Ohm’s law fail?

Ohm’s law fails to explain the behaviour of semiconductors and unilateral devices such as diodes. Ohm’s law may not give the desired results if the physical conditions such as temperature or pressure are not kept constant.

HOPE IT IS HELPS!!!

Answer 2

✯ Ohm's Law :

• ➥ This law states that the current between two points is directly proportional to the voltage across the two points.

✯ Expression :

• ➥ V = IR

✯ Where :

• ➥ V = Potential Difference

• ➥ I = Current

• ➥ R = Resistance

___________________________