Cisco CloudCenter: Get the Hybrid IT Advantage

Resistance (R)

Definition - What does Resistance (R) mean?

Resistance (R) is a property of a material used for describing the opposition provided to the flow of current. The higher the resistance provided by a material, the lower the flow of electrons or current through the material. It is measurable and is in contrast to the conductance property of a material, or the ease of electron flow through the substance. It can be either a desirable or undesirable property for a substance. The property of resistance is used in a wide variety of applications and appliances such as transistor radios, televisions and incandescent lamps.

Techopedia explains Resistance (R)

The term resistance is connected with direct current, whereas in the case of alternating current, the opposition to flow of current is known as reactance. There are many factors which influence the resistance of a substance such as length of wire used, cross-sectional area of the wire, type of material used and temperature. Higher resistance is provided by longer wire, whereas a wider cross-sectional area of wire helps in decreasing the resistance. Certain materials such as metals are known to be good conductors of electricity and hence provide less resistance. Temperature influences the electron structure and with increase in temperature, most materials provide less resistance to the flow of current.

The SI unit for resistance is the ohm, symbolized by the Greek letter omega, and also sometimes represented by letter R. Resistance of a material is one ohm when a current of one ampere passes through a material with a voltage of one volt. An ohmmeter is the instrument used to measure resistance. In the case of an electric circuit, resistors are components used to provide the resistance to current flow. Resistors are provided with bands of color or stripes which denote the resistance value.

Share this:

Connect with us

Email Newsletter

Join thousands of others with our weekly newsletter

The 4th Era of IT Infrastructure: Superconverged Systems
The 4th Era of IT Infrastructure: Superconverged Systems:
Learn the benefits and limitations of the 3 generations of IT infrastructure – siloed, converged and hyperconverged – and discover how the 4th...
Approaches and Benefits of Network Virtualization
Approaches and Benefits of Network Virtualization:
Businesses today aspire to achieve a software-defined datacenter (SDDC) to enhance business agility and reduce operational complexity. However, the...
Free E-Book: Public Cloud Guide
Free E-Book: Public Cloud Guide:
This white paper is for leaders of Operations, Engineering, or Infrastructure teams who are creating or executing an IT roadmap.
Free Tool: Virtual Health Monitor
Free Tool: Virtual Health Monitor:
Virtual Health Monitor is a free virtualization monitoring and reporting tool for VMware, Hyper-V, RHEV, and XenServer environments.
Free 30 Day Trial – Turbonomic
Free 30 Day Trial – Turbonomic:
Turbonomic delivers an autonomic platform where virtual and cloud environments self-manage in real-time to assure application performance.