Ohm's Law in Electric Circuits

• Ohm's Law, formulated by Georg Simon Ohm in 1827, is a fundamental principle in electrical engineering and physics, establishing the relationship between voltage, current, and resistance in an electrical circuit.
• Ohm's Law is expressed mathematically as: V = I × R, where V represents voltage, I denotes current, and R signifies resistance.
• According to Ohm's Law, in a circuit with a constant temperature, the current flowing through the circuit is directly proportional to the voltage applied across it and inversely proportional to the resistance.
• Georg Simon Ohm did not discover volts and current but established a fundamental relationship between these quantities, revolutionizing the understanding of electricity.
• Alessandro Volta, an Italian physicist, is renowned for inventing the electric battery in 1800, providing the foundation for the concept of voltage, and the unit of measurement for electrical potential difference is named after him.
• André-Marie Ampère made significant contributions to the understanding of electric currents and formulated Ampère's circuital law, which describes the magnetic field produced by electric currents, and the unit of electric current is named after him.
• An alarm clock draws 0.5 A of current when connected to a 120-volt circuit. To find its resistance, use the formula: R = V / I, resulting in a resistance of 240 Ω.
• A toaster produces 12 ohms of resistance in a 120-volt circuit. To find the current, use the formula: I = V / R, resulting in a current of 10 A.
• An electric heater works by passing a current through a coiled metal wire, making it red-hot. To find the voltage required to pass a current of 100 A through a wire with a resistance of 1.1 Ω, use the formula: V = I × R, resulting in a voltage of 111 volts.
• A subwoofer needs a household voltage of 110 volts to push a current of 5.5 A through its coil. To find its resistance, use the formula: R = V / I, resulting in a resistance of 20 Ω.
• A Walkman uses a standard 1.5 V battery. To find the resistance in the circuit when it uses a current of 0.01 A, use the formula: R = V / I, resulting in a resistance of 150 Ω.
• In a practice set with a 1.5-volt battery and a bulb with a resistance of 3 Ω, calculate the current using the formula: I = V / R, resulting in a current of 0.5 A.

Test your understanding of Ohm's Law, which establishes the relationship between voltage, current, and resistance in an electrical circuit. This quiz covers the principles and applications of Ohm's Law, essential for engineers, technicians, and students in the field of electrical engineering and physics.