What is meant by resistance in an electrical circuit?

What is meant by resistance in an electrical circuit?

• A. The energy source
• B. The opposition to the flow of electrons
• C. The magnetic field around a conductor
• D. The current through the conductor

Answer: (B)

Resistance is the opposition to the flow of electric current in a circuit. It describes how hard it is for charges to move through a material. When electrons travel, they collide with atoms in the conductor, which slows them down and converts some electrical energy into heat. The greater this opposition, the smaller the current for a given voltage, as captured by Ohm’s law: current equals voltage divided by resistance. So higher resistance means less current, and lower resistance means more current for the same voltage. That’s why resistance isn’t the energy source, the magnetic field around a conductor, or the current itself—the energy source drives the current, the magnetic field isn’t what resists flow, and the current is the flow of charges, not the opposition to it. Resistance is what you measure in ohms, and it depends on factors like the material, temperature, and geometry of the conductor.

Resistance is the opposition to the flow of electric current in a circuit. It describes how hard it is for charges to move through a material. When electrons travel, they collide with atoms in the conductor, which slows them down and converts some electrical energy into heat. The greater this opposition, the smaller the current for a given voltage, as captured by Ohm’s law: current equals voltage divided by resistance. So higher resistance means less current, and lower resistance means more current for the same voltage. That’s why resistance isn’t the energy source, the magnetic field around a conductor, or the current itself—the energy source drives the current, the magnetic field isn’t what resists flow, and the current is the flow of charges, not the opposition to it. Resistance is what you measure in ohms, and it depends on factors like the material, temperature, and geometry of the conductor.