Ohm's Law: Current and Voltage Relationship
The question describes a fundamental principle in electricity. The statement specifies that the electric current flowing through a metallic wire is directly proportional to the potential difference (voltage) across its ends, as long as the temperature remains the same. This relationship is defined by Ohm's law.
Understanding Ohm's Law
- Ohm's law states that the current (\(I\)) flowing through a conductor is directly proportional to the voltage (\(V\)) across its ends and inversely proportional to the resistance (\(R\)) of the conductor, provided the temperature and other physical conditions remain unchanged.
- Mathematically, this is represented as: \( V \propto I \) or \( V = IR \) where \(R\) is the constant of proportionality, representing resistance.
- The condition 'provided its temperature remains the same' is crucial for Ohm's law to hold true for metallic conductors.
Why Other Laws Don't Apply
- Ampere's law relates magnetic fields to electric currents.
- Coulomb's law describes the electrostatic force between charges.
- Joule's law deals with the heat generated by electric current (\(H = I^2Rt\)).
Therefore, the law defining the direct proportionality between current and potential difference at constant temperature is Ohm's law.
Similar Questions
Fill in the blank with the most appropriate option.
18 volts = _________ × 3 ohms.
- _____ states that the electric current flowing through a metallic wire is directly proportional to the potential difference 'V' across its ends provided its temperature remains the same.
According to Ohm's Law, which of the following is true?
According to Ohm's Law, how is current related to voltage and resistance?
- For a given potential difference (V), current (I) and resistance (R) across a conductor, Ohm's law is represented as:
A source of voltage V maintains a current I in a circuit. The power (P) input to the circuit by the source is given by:
Find the potential difference (in V) across a resistance of 2.5 kΩ through which a 2 mA current flows.
According to Ohm’s law, if current (I) increases and potential difference (V) remains constant, then:
Important Questions from Ohm’s Law
Three resistors having resistances in the ratio 1 : 2 : 3 are in parallel. The current through the resistors are in the ratio
Which of the law states that in any closed circuit the current is directly proportional to the voltage, provided the physical conditions of the circuit are kept constant?
Fill in the blank with the most appropriate option.
18 volts = _________ × 3 ohms.
- _____ states that the electric current flowing through a metallic wire is directly proportional to the potential difference 'V' across its ends provided its temperature remains the same.
The graphs between current (I) and voltage (V) for three linear resistors 1, 2 and 3 are given below:
If R 1, R 2and R 3are the resistances of these resistors, then which one of the following is correct?
