Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

What is the resistance R?

Rate this Question and Answer
Asked By: Damien Rbib | Last Updated: 16th April, 2020
Resistance (R) is a property of a material used for describing the opposition provided to the flow of current. It is measurable and is in contrast to the conductance property of a material, or the ease of electron flow through the substance.


Click to see full answer



Accordingly, what is the resistance R in the figure?

The actual value of resistance R, shown in the figure is `30 Omega`.

Secondly, what is resistance and its unit? Resistance is the hindrance offered by an object to the flow of current through it. SI unit of resistance is Ohm (Ω). It is resistance offered by an object when 1 volt potential difference is applied across it and 1 Ampere of current passes through it.

Regarding this, what is the simple definition of resistance?

Resistance is an electrical quantity that measures how the device or material reduces the electric current flow through it. The resistance is measured in units of ohms (Ω). If we make an analogy to water flow in pipes, the resistance is bigger when the pipe is thinner, so the water flow is decreased.

What is I in Ohm’s law?

A law relating the voltage difference between two points, the electric current flowing between them, and the resistance of the path of the current. Mathematically, the law states that V = IR, where V is the voltage difference, I is the current in amperes, and R is the resistance in ohms.

What are the EMF and internal resistance of the battery?

Electromotive Force and Internal Resistance. The electromotive force (e) or e.m.f. is the energy provided by a cell or battery per coulomb of charge passing through it, it is measured in volts (V). It is equal to the potential difference across the terminals of the cell when no current is flowing.

What is Ohm’s law in electricity?

Ohm’s law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and inversely proportional to the resistance (R). Therefore, if the voltage is increased, the current will increase provided the resistance of the circuit does not change.

What is an example of resistance?

Licensed from iStockPhoto. noun. Resistance is defined as a refusal to give in or to something that slows down or prevents something. An example of resistance is a child fighting against her kidnapper. An example of resistance is wind against the wings of a plane.

How is resistance formed?

During the flow, the electrons collide between themselves and with the solid structure. Due to this collision, heat is generated due to which the conductor atoms vibrate in their position. Flow of electrons is nothing but current. Hence, due to this, a resistance is offered to the flow of current.

Is resistance an adjective?

What’s the adjective for resistance? Included below are past participle and present participle forms for the verb resist which may be used as adjectives within certain contexts. resistant. Which makes resistance or offers opposition.

What are the laws of resistance?

The laws of resistance states that the Resistance “R” offered by a conductor depends upon following factors: The resistance of conductor is the obstruction posed by the conductor to the flow of current through it. The Resistance “R” is dependent on the Nature of the material.

What is the difference between ohms and continuity?

Ohms / Continuity Basics. An Ohmmeter is used to measure the resistance to electrical flow between two points. In other words, continuity means low or zero ohms and no continuity means very high or infinite ohms. Don’t get the terms zero ohms and infinite ohms confused, they mean opposite things.

Why resistance is important?

Therefore, it is sometimes useful to add components called resistors into an electrical circuit to restrict the flow of electricity and protect the components in the circuit. Resistance is also good because it gives us a way to shield ourselves from the harmful energy of electricity.

What is the SI unit of current?

Define SI unit of current. ANSWER. SI unit of current is ampere. 1 ampere is the constant current that will produce an attractive force of 2 × 107 Newton per meter of length between two straight, parallel conductors of infinite length and negligible circular cross section placed one meter apart in a vacuum.

What is the unit of current?

The SI unit of electric current is the ampere, which is the flow of electric charge across a surface at the rate of one coulomb per second. The ampere (symbol: A) is an SI base unit Electric current is measured using a device called an ammeter.

What is the unit of voltage?

Volt is the electrical unit of voltage or potential difference (symbol: V). One Volt is defined as energy consumption of one joule per electric charge of one coulomb.

What are the 3 forms of Ohm’s law?

Ohm’s law
  • Alternating current.
  • Capacitance.
  • Direct current.
  • Electric current.
  • Electric potential.
  • Electromotive force.
  • Impedance.
  • Inductance.

Why is Ohm’s law important?

Ohm’s law is vitally important to describing electric circuits because it relates the voltage to the current, with the resistance value moderating the relationship between the two.

What is current and voltage?

Current is the rate at which electric charge flows past a point in a circuit. In other words, current is the rate of flow of electric charge. Voltage, also called electromotive force, is the potential difference in charge between two points in an electrical field. Voltage is the cause and current is its effect.

What are ohms used for?

The ohm is the standard unit of electrical resistance in the International System of Units ( SI ). Ohms are also used, when multiplied by imaginary numbers, to denote reactance in alternating-current ( AC ) and radio-frequency ( RF ) applications.